Pregnancy Test Calculator Baby Center

Pregnancy tests are simple, quick ways to determine if you're pregnant. This calculator helps you understand your results and estimate your due date based on when you took the test.

How to Use This Calculator

To use this pregnancy test calculator, follow these steps:

Take a pregnancy test according to the instructions on the package.
Record the date you took the test.
Enter the test date in the calculator below.
Select whether the test was positive or negative.
Click "Calculate" to see your estimated due date.

For most accurate results, take the test first thing in the morning when your urine is most concentrated.

How Pregnancy Tests Work

Pregnancy tests detect the hormone human chorionic gonadotropin (hCG) in your urine. hCG is produced by the placenta after implantation of the fertilized egg.

The two main types of pregnancy tests are:

Urinalysis tests: Detect hCG in your urine
Blood tests: Detect hCG in your blood (more sensitive)

The average pregnancy lasts about 40 weeks (280 days).

Interpreting Your Results

If your test is positive, it means you likely have a pregnancy. If negative, it means you likely do not have a pregnancy.

Positive Test

If your test is positive:

Wait 1-2 weeks and take another test to confirm
If both tests are positive, you're likely pregnant
If one test is negative, wait and retest

Negative Test

If your test is negative:

Wait 1-2 weeks and retest
If still negative, you're likely not pregnant
If you're trying to conceive, consider medical evaluation

False negatives can occur in the first 7-10 days after ovulation. False positives are rare but can happen with certain medications.

Common Questions About Pregnancy Tests

Here are answers to frequently asked questions about pregnancy tests:

FAQ

How accurate are pregnancy tests?

Most home pregnancy tests are 99% accurate when taken according to instructions. However, accuracy can vary based on when you ovulate and when you take the test.

When should I take a pregnancy test?

The best time to take a pregnancy test is first thing in the morning, when your urine is most concentrated. This increases the accuracy of the test.

Can I get a false positive?

False positives are rare but can happen with certain medications, ovulation, or if you've recently had sexual intercourse. Always confirm with a second test.

How soon can I take a pregnancy test?

You can take a pregnancy test as early as the first day of your missed period. Some tests claim to detect pregnancy as early as 7-10 days after ovulation.