What is considered too early to take a pregnancy test

Understand the right time to take a pregnancy test for the most reliable result

You’re certain you’re showing the early signs of pregnancy, possibly including sore boobs, metallic taste in your mouth and even a little sickness, so you’re dying to take a pregnancy test but is it too early?

Some very sensitive tests can be used even before you miss a period.

Here are some important things to note to make sure you get the most accurate reading from your test and of course, to ensure you take it at the best time possible.

When is the best time to take a pregnancy test?

Timing is everything when you take a pregnancy test. Many tests advise you take the test as soon as your period is late. This is because your body will be making the pregnancy hormone, human chorionic gonadotrophin (hCG), by now and the test measures the amount detected in your urine.

If you’re not sure when your period is due, do a test at least 3 weeks after you last had unprotected sex.

It is important to remember that it can take a week or more after you’ve missed your period before you produce enough pregnancy hormones for a test to detect. If your period is late and your test is negative, leave it a week and if you still don’t have a period, do another test.

What time of day should I test?

The hormone hCG is most prominent in the morning, so taking the test in the morning can give you the most accurate result although many tests now say it doesn’t have to be in the morning.

Follow the instructions

Each test is different so don’t assume and make sure you take the time to read the instructions for the test you are using. Follow what it is says to the letter to ensure you get the most accurate result possible.

You might also like to read:

  • Can I get a false positive test?
  • When can morning sickness start?
  • Understanding pregnancy tests

What if there is a faint line on the test?

If you only get a faint like, be sure to check you have followed the instructions correctly as if you haven’t followed them exactly, it could explain the faint line. The test could also show a faint line if you’re not as far along in your pregnancy as you thought. To be sure, leave it a week and test again.

Can you get a false positive test?

The straight answer is no, a faulty home pregnancy test is rare and the most common explanation for a false positive test is that when you took the test you were pregnant. Sadly, it’s not unheard of for some women to have a positive test, but then have a heavy period a few days after their period was due which is why testing before your period is due can also detect early pregnancy loss. So when someone says they had a false positive result, it means that the test they took after the original test was not positive like the first.

If you've tested positive and are convinced you're showing other signs of pregnancy, but think you still have your period, it could be implantation bleeding.

By Lindsay Meisel | Published Aug 16, 2016 | Last updated Jan 13, 2020 ✓ Fact checked
Medically reviewed by Rachel Liberto, RN on August 15, 2019

If you’re trying to get pregnant, you’ve probably experienced the agony of wondering whether you should take a pregnancy test. Especially when you’re experiencing potential early signs of pregnancy like nausea, headaches, and fatigue, it can be hard to resist testing early. Do you really need to wait until the first day of your missed period, or can you test earlier?

How long should I wait before taking a pregnancy test?

Pregnancy tests only work when the pregnancy hormone human chorionic gonadotropin (hCG) has built up in your system. This usually happens around 11 – 12 days after ovulation. Most women get their period around 14 days after ovulation.

If you don’t know when you ovulated, you can approximate this window by taking a pregnancy test two days before your period is due.

Keep in mind that if you test before your period is due, you may get only a very faint line on the pregnancy test.

How long after ovulation can I take a pregnancy test?

So you’re an expert at tracking your ovulation? You may be able to take a pregnancy test earlier. But if you take it before 8 days past ovulation (DPO), you are likely to get a negative test—even if you are truly pregnant.

The reason why has to do with when implantation occurs. While it’s technically possible for implantation to occur any time between six and 12 days after ovulation, 85 percent of the time it occurs between eight and  10 DPO, and it only occurs at 6DPO 0.5% of the time. (Our implantation calculator post can help you estimate when it might have occurred for you.)

Even if conception has occurred, the fertilized egg does not start producing hCG—the hormone that pregnancy tests detect—until after implantation is complete. (And speaking of implantation … read our post on the truth about implantation bleeding.)

After implantation, hCG levels start doubling roughly every 48 hours. Baseline hCG levels, early pregnancy hCG levels, and hCG doubling time vary from woman to woman and from pregnancy to pregnancy. Along with the date of implantation, these factors will influence how early you can get a positive pregnancy test.

Deciding when to take a pregnancy test is a risk-benefit calculation: testing earlier than 12 DPO means weighing the risk of being disappointed about a possibly false result against the unlikely outcome of an early positive.

How likely is it to get a false negative pregnancy test?

Most home pregnancy tests are highly accurate if you wait until the first day of your missed period to take it. If you’re testing earlier, your chances of a false negative result are higher. The reasons why you might get a false negative include:

  1. Testing too early. Do not test earlier than 12 – 14 days after ovulation. If you don’t know when you ovulated, wait until the day your period is due.
  2. Testing too late. If you test after the first few weeks of pregnancy, something called the hook effect can create a false negative pregnancy test.
  3. Testing at the wrong time of day. Test on first morning urine, when the concentration of hCG (the pregnancy hormone) are highest.
  4. Testing on diluted urine. If you drink a large amount of liquid shortly before testing, your urine volume may increase so much that hCG is too dilute to measure (this is more of an issue in early pregnancy, when your hCG levels are still relatively low).
  5. Using a test that is not sensitive enough. If you are testing early, you need to use a more sensitive test (learn more about the best pregnancy tests).
  6. Not testing urine immediately. If the urine collected has been sitting around for too long before testing—usually 30 minutes or more—a false negative result can occur.

Why am I having pregnancy symptoms but a negative test?

There are two possible explanations for this: if your period is late but you have a negative pregnancy test, it most likely means that you ovulated later than usual. The second explanation is that you’re taking the test too early, before implantation has occurred.

Should you take a pregnancy test in the morning or night?

If you’re testing before your period is due, it’s best to take a pregnancy test in the morning, when the concentration of hCG in your urine is highest. If your period is due or late, your hCG levels are likely high enough that you can test any time of day and still get a positive result if you are pregnant.

What are the chances of a false positive pregnancy test?

Truly false positive pregnancy tests are rare. The risk of a false negative pregnancy test is much higher than the risk of a false positive. Below are some possible explanations for false positive pregnancy tests (or, as you’ll see, what just seems to be a positive test but actually is not):

  1. Evap or indent line. Waiting longer to read the results than specified in the test instructions can lead to what appears to be a positive pregnancy test, but is actually a result of ink pooling in the body of the test.
  2. LH peak. LH and hCG are biochemically very similar, so the presence of one will test positive for the other. For example, if you are taking ovulation tests and you are pregnant, the LH will be read as hCG (as will LH be read as hCG if you take an ovulation test and you are pregnant).
    Sometimes, the hormone hCG can be released from the pituitary at the time of your LH peak. If you take a pregnancy test during this time, there’s a small chance of a false positive.
  3. Chemical pregnancy. A high proportion of early pregnancies are miscarried even before the day of your period. Taking a test too early could detect a very early pregnancy that is not viable. Technically, this is not a false positive, because you really were pregnant.
  4. Perimenopause. Perimenopausal women have somewhat elevated levels of circulating hCG, even when they’re not pregnant. This could lead to a false positive result.
  5. Infertility treatment. Women undergoing hCG treatment (A.P.L, Pregnyl, Profasi, Pergonal) to stimulate ovulation may also receive false positive results if they test within 10 days of their last injection.

What type of test is best?

If you’re testing on the first day of a missed period, it doesn’t matter very much which test you use—most currently marketed tests are reliable and will yield a positive result for 98 percent of pregnant women. But if you’re testing early, you should use a more sensitive test—just remember that pregnancy tests are less likely to be accurate when taken before your missed period. (Here, we rank the best pregnancy tests by sensitivity.)

The more sensitive the pregnancy test, the more likely it is to detect pregnancy early. But more sensitive pregnancy tests are also more likely to return false positives.

In a study that tested six over-the-counter pregnancy tests, First Response and Answer were the most sensitive. Clear Blue Easy and Walmart Equate tests were the least sensitive.

By Lindsay Meisel | Aug 16, 2016


What is considered too early to take a pregnancy test

Lindsay Meisel

What is considered testing too early for pregnancy?

When is it too early to take a pregnancy test? Taking a pregnancy test sooner than eight days past your ovulation (DPO) might result in a false negative. This is because fertilized eggs don't start producing the pregnancy hormone that tests detect — hCG — until after implantation is complete.

How soon until a pregnancy test is positive?

You can carry out most pregnancy tests from the first day of a missed period. If you don't know when your next period is due, do the test at least 21 days after you last had unprotected sex. Some very sensitive pregnancy tests can be used even before you miss a period.

Can taking a pregnancy test too early be wrong?

Taking a pregnancy test too early can also give you a false negative, because even if you are pregnant, your hCG levels may not be high enough to be detected by the test. Many women get trapped in a cycle of testing and testing over and over again, whether their results were positive or negative.

Is 4 weeks too early for pregnancy test?

By the time you're 4 weeks pregnant, you can usually get a clear positive on a urine pregnancy test. It's a funny thing, but your egg may have only been fertilized in the last two weeks. Still, the dating for pregnancy begins with the start of your last menstrual period.