A pregnancy test checks your pee or blood to see if you're pregnant.
There are different reasons you might take a pregnancy test. Maybe you're trying to get pregnant and you want a positive result. Or maybe something interrupted your birth control. You also might take a pregnancy test before having a medical procedure or starting a new medication, to avoid complications. This is true whether you're biologically female, nonbinary, or transgender male. If you have a uterus and ovaries (and you're ovulating), and you’re having penetrative sex with a penis, you can get pregnant.
Here are the answers to some common questions about pregnancy tests.
Pregnancy tests check your pee or blood for a hormone called human chorionic gonadotropin (HCG). Your body makes this hormone when you're pregnant and a fertilized egg attaches to the wall of your uterus.
This usually happens about 6 days after fertilization. Levels of HCG rise quickly, doubling every 2 to 3 days.
Two main types of pregnancy tests are blood tests and urine tests.
Pregnancy blood tests
You get these at your doctor's office, but they’re not used as often as urine tests. That's because they can be costlier and have the same results. But blood tests can detect pregnancy earlier than a home pregnancy test, about 7-10 days after ovulation. Results take 2 hours to 2 days.
A blood pregnancy test uses a small sample of your blood from a vein in your arm. It detects the presence and amount of the pregnancy hormone in your body. That's helpful when your doctor needs to know the exact amount of HCG in your blood, and not just if it's present in your blood.
You might get a blood test for pregnancy if you're having fertility treatments or if your doctor thinks there might be a problem.
The two types of blood pregnancy tests are:
Pregnancy urine tests
You can take these at home or in a doctor's office.
Along with being private and convenient, home pregnancy tests are quick and easy to use. They’re also very accurate if you follow the directions. These pregnancy tests all work in a similar way. You test your pee in one of these ways:
You’ll need to wait a few minutes before seeing the results.
After you take this test, confirm your results by seeing your doctor.
Urine home pregnancy tests are about 99% accurate. Blood tests are even more accurate.
A home test’s accuracy depends on:
Some pregnancy tests can spot hCG before you miss a period. But the results will be more accurate if you wait until the first day of a missed period.
Results may also be more accurate if you do the test first thing in the morning when your urine is more concentrated.
These are urine tests described in a section above. Here is some more information about them:
Where to buy a pregnancy test. They're available in most drugstores, pharmacies, convenience stores, and grocery stores. Some dollar stores sell them. Some can be mail-ordered.
Pregnancy test price. Their cost varies, but they usually cost about $50 each. Some insurance plans cover the cost. You can also save money per test if you buy them in bulk.
Tips for taking at-home pregnancy tests. Some tips for taking home pregnancy tests are:
Results may show up as a line, a color, or a symbol such as a “+” or “-” sign. Digital tests show the words “pregnant” or “not pregnant.” It's important to know what a positive or negative result means.
If you get a positive result, you’re pregnant. This is true no matter how faint the line, color, or sign is. If you get a positive result, you may want to call your doctor to talk about what comes next.
False-positive results happen in very rare cases. This means you're not pregnant but the test says you are. You could have a false-positive result if you have blood or protein in your pee. Certain drugs, such as tranquilizers, anticonvulsants, hypnotics, and fertility drugs, could cause false-positive results.
If you get a negative result, you’re probably not pregnant. But you may be pregnant if:
If you get a negative result, try retesting within about a week to double-check. Some home pregnancy tests suggest doing this no matter what your first results are.
False-negative results might happen if you take the pregnancy test too early. The earlier you take it, the harder it is to detect HCG. For best results, take a home pregnancy test after the first day of your missed period.
If you take the test twice and get different results, call your doctor. A blood test is a good idea to confirm the result.
If you have any other questions about the pregnancy test or the results, call your doctor or the telephone number listed with the test.
A faint line on a pregnancy test can be confusing. It can happen because it's very early in your pregnancy and your pregnancy hormone level is low, or because some tests have less bold lines than others. Experts say a faint line usually means you're pregnant. But see your doctor to be sure.
An evaporation line on a pregnancy test is a slight, colorless streak where the positive line should be. This might happen if you wait longer than suggested to read your test result, or if the test gets wet. It doesn't mean you're pregnant. It's a good idea to take another test to get accurate results.
When you get a positive pregnancy test result, contact your doctor for an appointment. They might want to give you a blood test to confirm you're pregnant. It's important to know as soon as possible if you're pregnant so you can start receiving prenatal care and making healthy lifestyle changes, if necessary.
What are pregnancy symptoms in the first week? Most people have no symptoms the first week of pregnancy. Early signs usually appear weeks later. They include:
Can a urinary tract infection (UTI) cause a false positive pregnancy test? It's rare but possible. Serious UTIs can cause your pee to have high levels of leukocytes and nitrite, which can cause a false positive pregnancy test result.
Can a pregnancy test be wrong? Yes. But at-home pregnancy tests, when taken according to their package directions, are about 99% accurate.
Why is my pregnancy test negative but I don't have a period? It's possible your negative test result isn't correct, but that would be very rare. You probably aren't pregnant.You might want to repeat the pregnancy test. You may have something else going on, or another medical issue, such as:
If you have any of these symptoms, get medical attention: