Free Online Pregnancy Probability Test

If you think you might be pregnant, go ahead and try our online pregnancy calculator below! It's simple and easy and it doesn't cost a single buck.

While our pregnancy probability test can't see inside your belly to know exactly what's taking place, it will help you understand the likelihood whether you are indeed pregnant or not.

How to use the online Pregnancy Probability Calculator:

Enter your age, the average length of your period, and the first day of your last normal period. On average, there are 28 days in a menstrual cycle, but it can last from as little as 22 to as many as 44 days. The online pregnancy test uses data to plot a mathematical calculation which indicates the likelihood of whether you are pregnant or not.

Please note that we do not collect your personal information nor do we sell it or give it away. After you've taken our pregnancy probability quiz, be sure to swing by our Q&A section and see what Hannah is up to. Each day, she and Justin answer a couple pregnancy questions submitted by our visitors.

Online Pregnancy Test

The free Pregnancy Probability Calculator is brought to you by If you run into any problems with the pregnancy quiz, please don't hesitate to contact Hannah or Justin.

Your name (optional):

Your age:

On average, how many days is it from the first day of your period to the first day of your next period? (28 days is average):

Enter the first day of your last normal period: See the reference calendar below, if necessary.


Enter the day you think you became pregnant: See the reference calendar below, if necessary.


Did you have sex additional times during that month?   YES   NO

Go to next section (or scroll down below)

Reference Calendar

Have you experienced any of the following (check all that apply):
     Nausea or vomiting
     Fatigue, exhaustion, or a need for extra sleep
     Weight gain or feeling bloated
     Changes in appetite
     Frequent urination
     Sore or tender breasts
     Odd sensations in the abdomen
     Positive pregnancy test
     Sharp or unbearable pain in the abdomen or side

Are you... (please check all that apply):
     Under unusual stress lately
     Exercising more than usual
     Underweight for your height

Were you using birth control when you think you became pregnant?
     None (trying to get pregnant)
     None (not trying to get pregnant)
     Withdrawal (male removes penis before ejaculation of sperm)
     Male condoms
     Spermicides (chemicals immobilize the sperm; applied via cream, jellies)
     Oral contraceptives (the pill or mini-pill)
     Norplant (implants)
     Depo-Provera (the shot)
     Calendar or rhythm method (having sex when you are most/least fertile)
     Sympto-thermal method (monitoring basal temp, cervical mucus, cycle)
     Diaphragm (latex cup coated with with spermicidal cream or jelly)
     IUD (IntraUterine Device)
     Sponge or cervical cap
     Female condoms
     Female sterilization
     Vasectomy (permanent surgery for men preventing sperm release)

Online Pregnancy Possibility Test code updated: 06/02/2022; webpage last updated: 06/02/2022

DISCLAIMER: This online pregnancy probability quiz is a simple mathematical calculation which should never be used to replace a true medical urine or blood pregnancy test provided by your physician. If you think you are pregnant, or if this test indicates a possibility of pregnancy, we recommend you promptly contact your OB/GYN doctor. This pregnancy probability calculator does not imply or suggest the medical diagnosis of pregnancy. The resulting pregnancy report should not be considered medical advice.

The online pregnancy probability test is based on code which is copyright © 1998 Epigee and CPCWorld with ongoing calculator improvements made by Hannah and Justin of Please note that does not collect your personal information nor sell the information which you submit. Your use of our online pregancy quiz is fully confidential. cannot be held liable for misuse of these pregnancy probability calculators. If you are pregnant or suspect you are, please promptly see your health provider.

positive home pregnancy test

When can I take a urine home pregnancy test and get an accurate result?

The best time to take a pregnancy test is about a week after your expected period.

Most urine pregnancy tests claim to be "greater than 99 percent accurate" and imply that you can use them as early as the day you miss your period, but a study published in 2004 in the American Journal of Obstetrics and Gynecology has shown that this is misleading.

The amount of human chorionic gonadotropin (hCG) — the hormone pregnancy tests measure — in urine on any given day after implantation can vary a great deal from one woman to another.

Researchers at the University of New Mexico evaluated 18 tests and found that only one (First Response Early Result) was consistently sensitive enough to detect the levels of hCG that most pregnant women were likely to have on the first day of their missed period.

Most of the other tests were only sensitive enough to pick up about 16 percent of pregnancies at that point.

How can I get the best results from a urine home pregnancy test kit?

stay fit for a healthy pregnancy

First, check the expiration date on the test and make sure it's still good. If you've been storing the test anywhere that gets moist or warm (like the bathroom), it may have deteriorated, so throw it away and get a new one.

When you're ready to test, read the directions carefully because they vary with different brands. For best results, take the test first thing in the morning, when your urine is most concentrated.

If the test shows a negative result and you still haven't gotten your period, wait another few days or a week and try again. Don't assume that one negative result means you're not pregnant. If you don't get your period as expected, remember that you might still be pregnant (it's no time to go off on a drinking binge or do other things that are unsafe during pregnancy).

Does even a faint line mean I'm pregnant?

If you see a positive result on your test, even if it's very light, chances are good that you're pregnant. For a urine pregnancy test to give you a positive result, your body has to be making a detectable level of hCG and that only occurs as a result of pregnancy. Many women get a faintly positive result if they're not as far along as they expected.

To be sure, take another test in two or three days. If a positive result is more pronounced, congratulations. If the later test is completely negative, you may have had a very early miscarriage. Experts estimate that about 20 to 30 percent of all pregnancies end in miscarriage, so unfortunately this is very common.

Most pregnancy tests say that you can check results in about five minutes, but a study at the University of New Mexico found that in some cases, you may have to wait ten minutes for a positive result.