When To Take Pregnancy Test On Birth Control Pills _ How Early Can I Take A Pregnancy Test While On Birth Control

Summary: If you are taking birth control pills regularly, unexpected pregnancy is rare. However, in case you missed a pill, took it late, or had vomiting and diarrhea, the chance of conceiving increases. In such situations, you may take a pregnancy test to confirm if you are pregnant or not. Here’s what you need to know about taking a pregnancy test while on birth control pills.

1. How birth control pills prevent pregnancy

Birth control pills contain synthetic hormones that stop ovulation. Ovulation occurs when an egg is released from the ovaries, and it can only be fertilized by sperm for up to 24 hours. Since birth control pills prevent ovulation, there is no egg in the fallopian tubes to be fertilized, and hence pregnancy does not occur.

Additionally, birth control pills also thicken cervical mucus that blocks the sperm from entering the uterus. Furthermore, the thinning of the uterine lining does not allow the fertilized egg to implant and grow, thus avoiding pregnancy.

While birth control pills are reliable in preventing unexpected pregnancy, they are only effective when taken consistently and correctly.

2. When to take a pregnancy test

If you are taking birth control pills as directed, your chances of getting pregnant are extremely low. However, several factors can interact with the efficacy of the pills, making it necessary to take a pregnancy test if you suspect you may be pregnant.

You should take a pregnancy test at least three weeks after unprotected sex to ensure accurate results. Taking the test earlier may lead to a false-negative result as pregnancy hormones need time to build up in your body. You can buy over-the-counter pregnancy testing kits at a drugstore or order them online.

If you are unsure about the timing of your pregnancy test or how to take it, consult your healthcare provider for guidance.

3. How to take a pregnancy test

Pregnancy tests work by detecting the hormone human chorionic gonadotropin (hCG) in your urine. Generally, you should take the test first thing in the morning since hCG is the most concentrated in your urine at that time.

Follow the instructions carefully while taking the pregnancy test, and be sure to check the result interpretation period, which is usually around 5-10 minutes. Any reading after the expiration time is not considered valid.

If your pregnancy test is negative, but you still haven’t got your period, you may repeat the test after a few days or consult your healthcare provider for additional testing and evaluation.

4. Factors that affect the efficacy of birth control pills

Birth control pills are a reliable method of contraception when taken correctly. However, several factors can decrease their efficacy:

A. Missed pills: Missing a pill increases the chance of ovulation since there is no synthetic hormone to stop it. Always try to take your pills at roughly the same time every day, and if you missed one, follow the instructions on the pill packet for guidance.

B. Taking pills late: Taking pills later than usual can compromise the hormones’ efficacy; ideally, you should take your pills within three hours of your usual time.

C. Diarrhea and vomiting: If you experience diarrhea or vomiting for more than 24 hours after taking your pill, your body may not have absorbed enough synthetic hormones to prevent pregnancy. If this happens, use backup contraception until you start a new pack.

5. When to contact your healthcare provider

If you have missed one or more pills and had unprotected sex, contact your healthcare provider for advice. Depending on your situation, they may recommend taking Plan B, a hormone-based emergency contraceptive pill, or advise you to continue with your birth control pills and start a new pack right away.

Additionally, if you are pregnant or suspect you may be pregnant, seek medical attention to check your health and receive appropriate care.

If you experience severe abdominal pain, heavy bleeding, or other symptoms that indicate complications during pregnancy, call your healthcare provider immediately.


If you are taking birth control pills consistently and correctly, the chances of getting pregnant are rare. However, if you miss pills, take them late, or have vomiting and diarrhea, the efficacy of the pills decreases, and you may need to take a pregnancy test. Make sure to follow instructions while taking the test and consult your healthcare provider for guidance and additional testing, if needed.

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