Take a home pregnancy test from the first day your period is late. If your periods are irregular or you do not know when the next one is due, test 21 days after sex that could lead to pregnancy. Some tests work earlier, but testing too soon can give a false negative. If the result is negative and your period still has not come, test again in a few days.
When Is the Best Time to Take a Pregnancy Test?
The best time to take a home pregnancy test is usually the first day of a missed period or any time after that. By this point, the pregnancy hormone human chorionic gonadotropin (hCG) is more likely to be present in your urine at a level that a home test can detect.
According to the NHS, most pregnancy tests can be used from the first day of a missed period. If you do not know when your next period is due, take a test at least 21 days after the last time you had sex that could have resulted in pregnancy. This timing is particularly useful if your menstrual cycle is irregular or you cannot remember when your period was expected.
Waiting until your period is late generally improves the chance of getting a reliable result. However, the exact timing can vary because ovulation, when an egg is released from an ovary, does not always happen on the same day in every menstrual cycle.
Can You Take a Pregnancy Test Before Your Missed Period?
Yes. Some home pregnancy tests are designed to detect pregnancy before a period is due. However, they are not all equally sensitive, and an early negative result may not be reliable.
The Mayo Clinic explains that testing after the first day of a missed period is more likely to produce an accurate result. This is because hCG becomes detectable after a fertilized egg attaches to the lining of the uterus, and the amount of this hormone increases during early pregnancy.
If you choose to test before your expected period, follow the instructions for that particular test. A positive result may indicate pregnancy, but a negative result does not reliably rule it out when testing this early. Repeat the test when your period is due or after it has been missed.
What Time of Day Should You Take a Pregnancy Test?
You can take most home pregnancy tests at any time of day, especially once your period is late. However, using your first urine of the morning can be helpful when testing early because it is usually more concentrated and may contain a more easily detectable amount of hCG.
The U.S. Food and Drug Administration (FDA) recommends using the first urine of the morning to improve the chances of detecting pregnancy. If you test later in the day, avoid drinking unusually large amounts of fluid immediately beforehand, as this may dilute your urine and make hCG harder to detect.
If you have already missed your period, you generally do not need to wait until morning. Follow the instructions supplied with your test and repeat it later if the result is negative but pregnancy remains possible.
How Do You Use a Home Pregnancy Test Correctly?
Home pregnancy tests detect hCG in urine. Depending on the kit, you may need to hold the test strip in your urine stream, dip it into a collected urine sample, or place a few drops of urine on a designated area. The exact method and the time required to read the result vary by product.
MedlinePlus recommends following the test instructions carefully to help obtain an accurate result. Before testing, check the expiry date and make sure the packaging is intact. Then follow these steps:
- Read the instructions first. Check how to collect the urine sample and how long you should wait before reading the result.
- Use the test as directed. Apply the correct amount of urine or hold the test in the urine stream for the specified time.
- Wait for the recommended time. Use a timer rather than estimating when the result is ready.
- Check the control indicator. If the instructions specify a control line or symbol and it does not appear, the test may not have worked correctly. Use a new test.
- Read the result within the stated window. Do not interpret changes that appear outside the manufacturer's specified reading time.
You usually do not need a prescription to buy a home pregnancy test. You can use one privately, but a healthcare professional can help interpret an unclear or unexpected result.
How Accurate Are Pregnancy Tests?
Home pregnancy tests can be highly accurate when used correctly at the appropriate time. However, no test can guarantee a result in every situation. Accuracy depends partly on how early you test, how well the test detects hCG, and whether you follow the directions.
A test taken too early may be negative because the amount of hCG in the urine is not yet high enough for the test to detect. Incorrect use, diluted urine, or reading the result too soon may also affect the outcome. A positive result is usually a strong indication of pregnancy, although false-positive results can occur in certain circumstances.
Some fertility medicines that contain hCG can affect pregnancy test results. If you are receiving fertility treatment or the result does not fit your circumstances, discuss the findings with your healthcare professional.
What Should You Do If Your Pregnancy Test Is Negative?
A negative result means the test did not detect enough hCG in your urine to show a positive result. It does not always mean that you are not pregnant, particularly if you tested before or close to the date your period was expected.
The Mayo Clinic recommends repeating a home pregnancy test if the first result is negative but pregnancy remains possible. Depending on when you first tested, you may repeat it in a few days or about a week after your missed period.
When repeating the test, use a new kit, check the expiry date, and follow the instructions carefully. If you are unsure when your period is due, make sure enough time has passed since the last sex that could have resulted in pregnancy; the 21-day guideline can help establish when to test.
If you receive negative results on repeated tests but your period still has not started, contact a healthcare professional. They can assess your menstrual history and other relevant information and may recommend further testing. A late or missed period can have causes other than pregnancy.
What Should You Do If Your Pregnancy Test Is Positive?
A positive home pregnancy test usually means that hCG has been detected and pregnancy is likely. Arrange an appointment with a healthcare professional to discuss the result and the next steps. Depending on your circumstances, you may need another test or an ultrasound as part of your assessment.
Contacting a healthcare professional promptly allows you to discuss any medicines you take, existing health conditions, and appropriate pregnancy care. If you are unsure about the result, have obtained different results from several tests, or are taking fertility medicines that contain hCG, professional advice can help clarify the situation.
Is a Blood Pregnancy Test Better Than a Home Test?
Both urine and blood pregnancy tests look for hCG, but they differ in how they are performed and how much of the hormone they can detect. A home urine test is convenient, provides a quick result, and is usually sufficient for checking for pregnancy after a missed period.
According to Cleveland Clinic, a healthcare professional may use a blood test when pregnancy needs to be assessed earlier or when additional information is needed. Blood tests can detect smaller amounts of hCG, and some measure the exact amount of the hormone rather than simply reporting a positive or negative result.
A blood test is not necessary for everyone who takes a home pregnancy test. Whether it is useful depends on the timing, the test results, your medical history, and the reason for testing. A healthcare professional can help determine which approach is appropriate.
When Should You Seek Medical Advice About Pregnancy Testing?
Consider contacting a healthcare professional if your period remains absent despite repeated negative home tests, your results are inconsistent, or you are unsure how to interpret the result. They can review the timing of your test and decide whether additional testing is appropriate.
Seek urgent medical assessment if pregnancy is possible and you develop significant abdominal or pelvic pain, particularly on one side, or vaginal bleeding accompanied by pain, dizziness, or fainting. Do not rely on a home pregnancy test alone to assess these symptoms, because an early negative result does not exclude every pregnancy-related problem.
For most people, the simplest approach is to test from the first day of a missed period, or at least 21 days after sex that could have caused pregnancy when the expected period date is unknown. If the result is negative and your period does not arrive, repeat the test and seek professional advice when needed.