How long after conception can i take a pregnancy test

You want to know as soon as possible.

If you’re wondering if you’re pregnant, you need an answer. Immediately. However, that’s not necessarily possible if you want the most accurate results.

How soon can you take a pregnancy test after sex? The answer may surprise you.

“Many women panic when they realize they’ve missed a birth control pill or they’ve missed a period,” said Dr. Hardison. “We want you to know that we can help guide you through this process in a way that ensures you’re getting the most accurate results.”

How Long After Sex Can You Have a Pregnancy Test?

The short answer?

Most home pregnancy tests can be done from the first day of your missed period. If you’re not sure when you’re having your next period—or if your period is irregular– take the test at least 10 days after you had unprotected sex.

There are some extra sensitive pregnancy tests that can be done before you miss your period. Some of these can be completed as soon as eight days after conception.

But it’s a little-known fact that conception doesn’t necessarily begin immediately after you’ve had sex.

In fact, it can take up to five days for the sperm to fertilize an egg. Even after that, it takes several days for the egg to travel to the uterus, where it plants itself into the uterine lining.

From sex to pregnancy can take from two to three weeks.

Therefore, your results won’t be accurate if you take a test before a missed period.

Are Home Pregnancy Tests Accurate?

Home pregnancy tests are fairly accurate, though they may have difficulty diagnosing a pregnancy if a woman has only recently missed a period. In addition, fertility drugs or certain medications can interfere with the results.

If you are pregnant, it’s important to begin your prenatal care right away.

False Negative Results

You can get a false-negative from a home pregnancy test. This means that you are pregnant but the test said that you’re not.

False-negatives can occur when:

• You take the test too early
• Check the test results too soon – it’s important to follow the package directions carefully
• Use diluted urine – it’s best to use first-morning urine because it’s the most concentrated

If you get a negative result and your period still hasn’t started, repeat the test. Even better, contact us for an appointment.

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• Definition
  • What Are Pregnancy Tests?
• Positive vs. Negative
  • What Do Pregnancy Test Results Mean?
• When to Take
  • When Can A Pregnancy Test Be Taken?
• False Results
  • Why Might A Pregnancy Test Produce the Wrong Result?
• Guide
  • How Soon Will A Pregnancy Test Read Positive? Topic Guide

In 6 to 12 days after conception, a woman may experience implantation bleeding. About 7 days after that, hormone levels in the urine are high enough to detect using a home pregnancy test. In general, take the test after you notice your menstrual period is late.

While some pregnancy tests claim to work a few days before a missed period, the results are usually less accurate at that point. Some tests may be able to detect pregnancy hormones in urine as early as 10 days following unprotected sex, but the results are not very reliable, and women may get a false positive or false negative test result.

For women who have irregular periods or who do not get periods at all, testing about 3 weeks after unprotected sex may yield more reliable results.

• If a test reads positive, a woman may want to check with her doctor for a blood pregnancy test to confirm the results. 
• Most women who have a positive pregnancy test should wait a week or two before calling the doctor for a blood test. 

What Are Pregnancy Tests?

Pregnancy tests are used to verify if a woman is pregnant. They work by checking urine or blood for a hormone called human chorionic gonadotropin (HCG) that the body produces when pregnancy occurs. This hormone is released when a fertilized egg attaches to the lining of the uterus, signaling the beginning of pregnancy.

What Do Pregnancy Test Results Mean?

If pregnancy test results are positive, it means a woman is pregnant. If they’re negative, it means a woman is not pregnant.

When Can A Pregnancy Test Be Taken?

Pregnancy tests may be taken any time after a woman’s menstrual period is late.  

A woman may also choose to test after implantation bleeding has occurred. Implantation bleeding is an early sign of pregnancy. It occurs when a 6 to 12-day-old fertilized egg attaches to the inner lining of the uterus, causing light vaginal bleeding or spotting. About one-third of women experience implantation bleeding, which is normal and typically happens near the time of a woman’s next expected menstrual period.

About four to five days after implantation bleeding, HCG levels in the body reach detectable levels in the blood. For at-home urine pregnancy tests, it may take up to 7 days for HCG levels in the urine to reach detectable levels for testing.

Why Might A Pregnancy Test Produce the Wrong Result?

There are 2 types of inaccurate results:

• False negative – the test indicates a woman is not pregnant but she is
• False positive – the test shows a woman is pregnant but she’s not

There are several reasons for inaccurate results:

• Urine is too dilute – this can occur if a woman drinks too much water or tests later in the day
• Testing too soon after unprotected sex – the body may not have produced enough HCG to be detectable 
• Using a test that does not detect lower levels of HCG – check package labels for which tests are more sensitive
• Using an expired test
• Not using a test right away after opening
• Use of infertility medications such as clomiphene (Clomid), menotropins (Pergonal, Humegon, Repronex) can cause false positives 
  • The manufacturer of Clomid suggests waiting three days between the last Clomid dose and the first day testing for ovulation

QUESTION

Reviewed on 9/30/2022

References

Image source: iStock Images

Medscape Medical Reference

https://www.plannedparenthood.org/learn/pregnancy/pregnancy-tests

https://utswmed.org/medblog/home-pregnancy-tests/

https://www.babymed.com/fertility-problems/making-clomiphene-clomid-work-you