Taking a home pregnancy test is straightforward: you either hold the test stick in your urine stream or dip it into a cup of collected urine, then wait a few minutes for the result. The key to getting an accurate answer is testing at the right time with the right technique. Here’s everything you need to know to do it correctly.
When to Take the Test
Home pregnancy tests work by detecting a hormone called hCG, which your body starts producing after a fertilized egg implants in the uterus. The amount of hCG in your urine roughly doubles every two to three days in early pregnancy, so timing matters a lot. Most standard tests need hCG levels of at least 25 mIU/mL to reliably detect a pregnancy, and some early-detection tests can pick up levels as low as 6 mIU/mL, though only about half the time at that threshold.
Testing too early is the most common reason for a wrong result. According to the FDA, 10 to 20 out of every 100 pregnant women will get a negative result if they test on the first day of a missed period. For the most reliable results, wait one to two weeks after your missed period. If you’re using an early-detection test, some can be used up to six days before a missed period, but accuracy improves significantly with each day you wait.
Use your first morning urine whenever possible. Your urine is most concentrated after a full night without drinking fluids, which means hCG levels are at their highest. If you test later in the day, drinking a lot of water beforehand can dilute your urine enough to cause a false negative.
Step-by-Step Instructions
Home pregnancy tests come in two main formats: midstream wand tests and dip strip tests. Both use the same chemistry and are equally accurate when used correctly. The difference is just in how you get urine onto the test.
Midstream Wand Tests
Remove the cap from the absorbent tip and hold it pointing downward directly in your urine stream for at least 7 to 10 seconds. This ensures the test collects enough of a sample. Then lay the test flat on a clean surface with the result window facing up and wait. Most tests need about 5 minutes to finish processing, though some give results in as little as 3 minutes. Check the instructions on your specific test for the exact wait time.
Dip Strip Tests
Collect your urine in a clean, dry cup. Then dip the absorbent end of the strip into the urine for at least 10 seconds. Remove the strip, lay it flat, and wait for the result window to develop. Strip tests are typically much cheaper than wand tests and perform at similar accuracy and sensitivity levels, making them a good option if you want to test multiple times.
Reading Your Results
Most non-digital tests show results as lines. One line (the control line) confirms the test worked. A second line in the test area means pregnant. Even a faint second line counts as a positive result, as long as it has visible color in it and appeared within the time window specified in the instructions (usually 3 to 5 minutes).
Digital tests display the words “Pregnant” or “Not Pregnant” (or “Yes” and “No”), which eliminates the guesswork of reading lines. Their detection threshold is similar to standard line tests, generally around 25 mIU/mL. In FDA testing, digital tests produced correct results about 96.5% of the time, with occasional false positives caused by defective sticks or sample errors. If you find reading lines stressful, a digital test can offer more peace of mind.
What About Evaporation Lines?
If you check your test after the recommended reading window has passed, you may see a faint mark where the positive line would be. This is likely an evaporation line, not a true positive. Evaporation lines are colorless, faint streaks that look like a watermark. They have no visible dye in them. A true positive, even a faint one, will have actual color (pink or blue, depending on the brand). The simplest way to avoid confusion is to read your result within the timeframe on the box and then discard the test.
What Can Cause a Wrong Result
False negatives are far more common than false positives. The most frequent cause is simply testing too early, before hCG levels have risen high enough to detect. Other causes include diluted urine from heavy fluid intake, not holding the test in urine long enough, or using an expired test.
False positives are rare but can happen. Fertility medications that contain hCG (injectable treatments used to trigger ovulation) will cause a positive result even if you’re not pregnant. Certain other medications can also interfere, including some antipsychotics, the anti-seizure medication carbamazepine, some anti-nausea drugs, and certain antihistamines. A recent miscarriage or ectopic pregnancy can also produce a positive, because hCG can remain in your system for several weeks afterward.
If you get a result you weren’t expecting, the simplest next step is to retest in two to three days. If you’re truly in early pregnancy, hCG levels will have risen noticeably and the line will be darker. If you’re not pregnant, a follow-up test should be clearly negative.
Digital Tests vs. Line Tests
Both types detect the same hormone at roughly the same sensitivity. The practical difference is in how you read them. Line tests require you to interpret whether a faint line counts as positive, which can be genuinely ambiguous in very early pregnancy. Digital tests remove that interpretation by giving you a word-based result. The tradeoff is cost: digital tests typically run several dollars more per test, and they can’t show you whether a line is getting darker over time, which some people find reassuring in early weeks.
If you’re testing before your missed period and want to track progression, inexpensive dip strips let you test daily without spending a fortune. If you want a single, clear answer on or after your missed period, a digital test is the most user-friendly option.
After a Positive Result
A positive home pregnancy test is generally reliable, especially if taken on or after the day of your missed period. The next step is scheduling an appointment with an OB/GYN. This is particularly time-sensitive if you’re over 35 or have a history of complications like previous miscarriage or C-section.
At your first prenatal visit, your provider will do a physical exam, review your medical history, and estimate how far along you are based on the date of your last menstrual period. If that date is uncertain, an ultrasound will be ordered. A first-trimester ultrasound is the most accurate way to date a pregnancy and will also confirm the heartbeat, check that the embryo has implanted properly, and measure the baby’s length.