The Benefits of Left and Right Ovaries for Pregnancy: Which Is the Best?

ByAnjali Gupta
Updated: 8 May 2025, 5:19 pm

Both the left and right ovaries play important roles in your fertility, but determining which is "better" for pregnancy can be difficult. Understanding how each ovary contributes to fertility and recognising their differences can help you choose and support your pregnancy.

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The ovaries are central to female reproductive health, serving as the primary site for egg production and hormone regulation, including oestrogen and progesterone, which govern the menstrual cycle and prepare the body for pregnancy.

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While both ovaries share similar functions, subtle differences-such as slight variations in follicle count or size, may exist, though these typically do not significantly impact fertility in healthy individuals.

Understanding their role, including the alternating ovulation process and the precise hormonal timing required for conception, is critical for optimising fertility strategies, identifying potential challenges, and navigating the pregnancy journey with informed clarity.


Anatomy of the Ovaries

Understanding the structure and function of the ovaries is essential for making informed fertility choices.

  • Location and structure of the ovaries

The ovaries are two tiny, almond-shaped organs that are situated in the female pelvis on either side of the uterus. The ovarian ligament connects each ovary, which ranges in length from 3 to 5 centimetres, to the uterus. Oocytes, or eggs, and hormones like progesterone and oestrogen, which are essential for controlling the menstrual cycle and promoting pregnancy, are produced by the ovaries.

  • Hormonal functions of the ovaries

Numerous important hormones that affect different body functions are produced by the ovaries. Some of them are:

  • Oestrogen: This hormone is crucial for the development of female secondary sexual characteristics, regulation of the menstrual cycle, and maintenance of pregnancy.
  • Progesterone: Produced mainly during the luteal phase of the menstrual cycle, progesterone prepares the uterine lining for the potential implantation of a fertilised egg.
  • Androgens: Although typically associated with male physiology, androgens are also produced by the ovaries and play a role in female sexual function and libido.

  • Ovarian Function During the Menstrual Cycle

Several aspects of the ovaries even affect the menstrual cycle. Some of the aspects include.

  • Follicular phase and ovulation

The follicular phase is the first of several phases that make up the menstrual cycle. Follicle-stimulating hormone (FSH) promotes the development of ovarian follicles, each of which contains an immature egg, during this stage. Ovulation usually occurs on day 14 of a 28-day cycle after one follicle becomes dominant and develops into a Graafian follicle.

  • Luteal phase and hormonal Changes

The luteal phase starts after ovulation. The corpus luteum, which secretes progesterone and some oestrogen, develops from the ruptured follicle. The endometrium is primed for possible implantation by these hormones. The corpus luteum degenerates in the absence of fertilisation, resulting in a decrease in hormone levels and the start of menstruation.

  • Do your ovaries take turns ovulating?

No, ovulation is not a precise left-right alternation. Although many believe ovaries "switch sides" every cycle, studies indicate it is arbitrary, you could ovulate from the same ovary several times in succession.

Due to improved blood supply, the right ovary ovulates a bit more frequently (55% of the time). Rest assured, this randomness doesn't imply one ovary is "broken"; both stay functional unless impacted by disorders like PCOS or endometriosis.

  • How PCOS and endometriosis affect the ovaries unevenly

Usually affecting both ovaries, PCOS creates several small cysts and chemical abnormalities that interfere with ovulation. On ultrasound, though, one ovary could seem more cystic.

Often targeting one ovary, endometriosis creates "endometriomas" (blood-filled cysts). Especially if surgically removed, these cysts harm the ovarian tissue, hence lowering egg reserve over time.

  • Do ovarian cysts impact left/right fertility differently?

Most simple cysts don’t affect fertility. However, large or repeated cysts on one ovary, like endometriomas, can lower the number of eggs it produces. For example, a cyst on the left ovary may reduce its function, but the right ovary often works well enough to make up for it.

  • Can ovulation influence early pregnancy symptoms?

Anecdotally, some say you might experience one-sided discomfort or bloating, which matches your ovulation side. But there is no scientific proof of this. Hormonal changes in early pregnancy influence the entire body; so, side-specific symptoms are probably coincidental or the result of increased awareness.


How Ovaries Contribute to Fertility

Ovaries can certainly act significantly in terms of improving fertility. You need to know about it to ensure that conception is healthy.

  • Role of ovaries in egg production

The ovaries play a key role in reproduction by producing and releasing eggs. You are born with a limited number of eggs, and both their quantity and quality decrease with age. For pregnancy to occur, an egg must be released during ovulation and successfully fertilised by sperm.

  • Hormone production and its impact on fertility

Hormones produced by the ovaries play a significant role in fertility. Oestrogen and progesterone regulate the menstrual cycle and prepare your body for pregnancy. An imbalance in these hormones can lead to irregular cycles, anovulation (lack of ovulation), and difficulties in conceiving.


Differences Between the Left and Right Ovaries

  • Anatomical variations

Although the primary functions of the two ovaries are the same, there are some anatomical differences. Because the sigmoid colon is located on the left side, the right ovary is usually positioned slightly lower than the left. Blood and lymphatic fluid drainage may be impacted by this positioning.

  • Blood supply and nerve connections

The ovarian arteries, which emerge from the abdominal aorta, provide blood to the ovaries. The left ovary empties into the left renal vein before arriving at the inferior vena cava, whereas the right ovary empties into the inferior vena cava. Variations in ovarian function and hormone production may be influenced by this difference in venous drainage.

  • Hormonal differences, if any

Research indicates that there may be slight hormonal differences between the two ovaries. Studies have shown that the right ovary tends to ovulate more frequently and may produce oocytes with a higher fertility potential compared to the left ovary. This phenomenon is thought to be related to differences in blood supply and hormonal regulation.


Which Ovary is the Best?

Now, when you are thinking about which ovary is the best during your pregnancy, there are several things to be considered.


  • Does the side of ovulation matter for conception?

Researchers have been interested in the question of whether one ovary is better than the other for conception. According to research, the right ovary may be slightly more fertile than the left. For example, oocytes extracted from the right ovary produced more high-quality embryos and had higher fertilisation rates than those taken from the left ovary, according to research published in the American Society for Reproductive Medicine. [source].

  • Studies on left vs. right ovary contributions

Several studies have explored the differences in fertility outcomes based on which ovary is involved in ovulation:

  • A study involving nearly 800 IVF patients found that the right ovary yielded a higher number of mature oocytes and better fertilisation rates compared to the left ovary [source].
  • Another study indicated that women who ovulated from the right side had a statistically significant advantage in terms of pregnancy rates.
The evidence indicates that the right ovary may have a slight advantage in terms of fertility potential, even though both ovaries are capable of producing viable eggs and sustaining pregnancy. Individual experiences can differ, though, and fertility is greatly influenced by age, lifestyle, and general health.


Factors Affecting Ovarian Function

Several factors affect ovarian functioning, and it is important for you to know them to ensure your pregnancy is planned accordingly.

  • Age and ovarian reserve

One of the most important variables influencing ovarian function in women is their age. Women's ovarian reserve, or the quantity and quality of eggs, diminishes with age. This might lead to a decline in fertility and irregular ovulation.

  • Lifestyle factors

Several lifestyle factors can impact ovarian health and function:

  • Nutrition: A balanced diet rich in vitamins and minerals supports hormonal balance and overall reproductive health.
  • Exercise: Regular physical activity can help maintain a healthy weight and improve hormonal regulation.
  • Stress: Chronic stress can disrupt hormonal balance and negatively affect ovarian function.

  • Medical conditions

Certain medical conditions can also impact ovarian function:

  • Polycystic Ovary Syndrome (PCOS): This hormonal disorder can lead to irregular ovulation and fertility challenges.
  • Endometriosis: This condition can affect the ovaries and lead to scarring, which may impact egg release and overall fertility.


When to Seek Medical Advice

Signs of Ovarian Dysfunction

You should be aware of signs that may indicate ovarian dysfunction, including:

  • Irregular or absent menstrual cycles
  • Difficulty conceiving after trying for a year (or six months if over 35)
  • Unexplained weight gain or loss
  • Severe pelvic pain


Importance of Regular Check-Ups

Regular gynaecological check-ups are essential for monitoring ovarian health. Early detection of potential issues can lead to more effective treatment options and better fertility outcomes.


Lifestyle Tips for Optimal Ovarian Health

  • Nutrition for Reproductive Health

    • Fruits and Vegetables: Rich in antioxidants, they help combat oxidative stress.
    • Healthy Fats: Sources like avocados, nuts, and olive oil support hormone production.
    • Whole Grains: Provide essential nutrients and help maintain stable blood sugar levels.

  • Importance of Regular Exercise


  • Engaging in regular physical activity can improve blood circulation, reduce stress, and help maintain a healthy weight, all of which contribute to optimal ovarian function.

  • Stress Management Techniques


  • Mindfulness and Meditation: These practices can help reduce stress and promote hormonal balance.
  • Yoga: Gentle yoga can improve flexibility and reduce stress levels, benefiting overall reproductive health.

  • Additional Tips


  • Stay Hydrated: Proper hydration supports overall health and can improve hormonal balance.
  • Limit Alcohol and Caffeine: Excessive consumption can negatively impact hormonal balance and fertility.
  • Avoid Smoking: Smoking is linked to reduced fertility and can harm ovarian function.

Understanding the difference between your left and right ovaries can help with fertility and getting pregnant. At the same time, your right ovary might have a slight edge in fertility, but your age, lifestyle, and overall health play a big role too. By seeing your healthcare professional regularly, you can take better care of your ovaries and boost your chances of getting pregnant.


FAQs on The Benefits Of Left and Right Ovary For Pregnancy: Which Is The Best?

  1. Can you get pregnant if only one ovary is functional?
    With just one working ovary, it is possible to become pregnant. Pregnancy-related hormones and eggs can still be produced by the remaining ovary.
  2. Are there specific tests to evaluate ovarian function?
    Indeed, ovarian function can be assessed by several tests, including ovarian reserve tests (like the antral follicle count), ultrasound examinations to gauge follicle development, and hormone level tests (like FSH, LH, and estradiol).
Disclaimer: Medically approved by Dr Smriti Gupta, HOD, Obstetrics & Gynecology, Chhatrapati Shivaji Subharti Hospital, Meerut

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