Can I test for pregnancy before my missed period?

You can do it with the help of a highly sensitive test (10 mIU/mL or less). However, the chances of getting false negatives are higher when you test early. You can take another test after a missed period to confirm.

Why did one brand show positive and another negative on the same day?

A more sensitive brand may detect lower hCG levels that others may fail to pick up, so it can happen if you use tests from two brands.

How soon should I repeat the test if it’s negative?

Test again after 2-3 days by taking the sample from your first morning urine, as hCG levels may be easier to detect then.

How Pregnancy Test Sensitivity Differs Between Brands

Pregnancy tests can be confusing if you are reading them for the first time. One test may show two lines, meaning a positive result, while the other one may show only one. This variation can happen on the same day of the test.

Tests from different brands have varying sensitivity to detect the pregnancy hormone (hCG). Understanding the reasons can help you take the test correctly and also save a lot of time.

What Does Pregnancy Test Sensitivity Mean?

Pregnancy test sensitivity means the minimum amount of hCG (human chorionic gonadotropin) a brand can detect. All the brands' tests rely on detecting this hormone, which is released after a fertilised egg attaches to your uterus.

If a test is sensitive, it simply means it can detect pregnancy early.

Highly sensitive tests can detect 10–15 mIU/mL
Standard tests detect 20–25 mIU/mL
Less sensitive tests may need a minimum of 50 mIU/mL

So, if you want to test before you miss your period, then a sensitive brand test can give you a better chance of picking up even a small amount of hormone.

Why Do Sensitivity Levels Differ Between Brands?

The tests from brands are based on the following factors:

Detection Technology: Premium brands use advanced antibodies that can catch smaller amounts of hCG faster.
Testing Method: Some tests use digital sensors that read the result automatically (“Pregnant” or “Not Pregnant”), while others rely on colour change. Digital tests are more expensive but are not usually sensitive.
Target User Group: Some tests are made for early detection, so they can be used 5–6 days before your missed period. Most are designed for standard use, which means after missing your period.

Does a More Sensitive Test Mean It’s Always Better?

A high sensitivity test is great if you want to test early, but it may detect pregnancies that may not progress. This type of test can also detect a chemical pregnancy by giving a positive result and then a negative one. It happens because the pregnancy does not continue.

How Can You Choose the Right Pregnancy Test for You?

Ask yourself the following questions to help you make a decision for the correct test.

1. How early do you want to test?
Opt for an early detection test (10 mIU/mL or lower) if you want to test before missing your period.

2. Do you want a clear result or a line test?
Reading faint lines can be stressful, so you can go for a digital test that may cost more.

3. Are you on a budget?
Buy a regular strip test (like i-Can), which is cheaper and accurate after your missed period.

4. Are you taking fertility medications or treatments?
Some medicines can affect early hCG levels. You can test a bit later or check with your gynaecologist if this is your case.

What Can Affect Pregnancy Test Accuracy?

The test can be wrong if you test too early, before enough hCG is produced.
If you drink too much water before testing, it can dilute your urine and give you a false negative.
You do not follow instructions properly (timing, sample amount, or reading time).
You are on certain fertility or hormone medicines.

What Should You Do If You Get Confusing Results?

Your anxiety may begin to rise if your test remains unclear. Here’s what you can do in such cases.

A faint line - You may need to take another test after 48 hours.
Different results from different brands - Use a test with lower sensitivity or get a lab blood test to confirm the result.
Symptoms but negative tests - Some women naturally produce hCG at a slower rate, so visit your doctor.

When Should You See a Doctor?

You should reach out to your doctor if you experience any of the following signs.

You have had multiple unclear results
You have pregnancy symptoms (missed period, nausea, breast tenderness), but are getting negative tests repeatedly.
You experience severe pain or bleeding after a positive result. It may indicate an ectopic pregnancy or other complication.

Takeaway: Sensitivity Helps, but Timing Matters More

The brands of pregnancy tests predict the results based on the hCG levels, but testing at the right time is crucial. Interpret the results calmly and follow the best approach.

Choose a reliable brand
Test after your missed period, if you are using a standard test
Confirm with a doctor

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FAQs on How Pregnancy Test Sensitivity Differs Between Brands?

Can I test for pregnancy before my missed period?
You can do it with the help of a highly sensitive test (10 mIU/mL or less). However, the chances of getting false negatives are higher when you test early. You can take another test after a missed period to confirm.
Why did one brand show positive and another negative on the same day?
A more sensitive brand may detect lower hCG levels that others may fail to pick up, so it can happen if you use tests from two brands.
How soon should I repeat the test if it’s negative?
Test again after 2-3 days by taking the sample from your first morning urine, as hCG levels may be easier to detect then.