To do a pregnancy test at home, you either hold the test stick in your urine stream for 7 to 10 seconds or dip it in a cup of collected urine for at least 10 seconds, then lay it flat and wait about 5 minutes for results. The process is simple, but small details around timing, urine concentration, and reading the result correctly make a real difference in accuracy.
When to Take the Test
Home pregnancy tests detect a hormone called hCG that your body starts producing after a fertilized egg implants in the uterus. The amount of hCG in your urine roughly doubles every two days in early pregnancy, so testing too early is the most common reason for a false negative.
The best time to test is on or after the first day of your missed period. At that point, hCG levels are typically high enough for a standard test to pick up reliably. “Early result” tests claim to work several days before a missed period, but their sensitivity drops sharply at low hCG levels. FDA testing data shows that at very low concentrations (around 6 mIU/mL), only about 38% of consumers got a positive reading, while at 12 mIU/mL the detection rate hit 100%. In practical terms, that means testing a few days early might catch a pregnancy, but a negative result at that stage doesn’t rule one out.
Use First Morning Urine
Your first pee of the morning contains the highest concentration of hCG because it’s been collecting in your bladder overnight. If you can’t test in the morning, make sure urine has been in your bladder for at least three hours before testing. Drinking a lot of water beforehand dilutes the hormone and can turn what should be a positive into a false negative.
Step-by-Step Instructions
There are two ways to expose the test strip to urine. Both work equally well.
Midstream Method
Remove the plastic cap from the test to reveal the absorbent tip. Hold the tip directly in your urine stream for at least 7 to 10 seconds. You want the absorbent pad fully saturated, so don’t rush this step. Replace the cap, lay the test flat on a clean surface, and wait 5 minutes.
Cup Method
Collect urine in a clean, dry container. Dip the absorbent end of the test strip into the urine so that at least half the pad is submerged. Hold it there for at least 10 seconds. Remove it, recap it, lay it flat, and wait 5 minutes.
Whichever method you choose, keeping the test horizontal while it processes prevents urine from flowing unevenly across the result window.
How to Read the Results
Most tests display results as lines in a small window. One line (the control line) appears to confirm the test worked. A second line means the test detected hCG, indicating pregnancy.
A faint second line still counts as a positive, as long as it has actual color. Compare it to the control line: a true positive should be the same color (usually pink or blue, depending on the brand) and roughly the same width, running the full height of the window. It may be lighter or slightly blurred, but it should clearly have color to it.
An evaporation line, on the other hand, is colorless. It looks gray, white, or like a faint shadow, and it typically appears after the test has been sitting for too long. This is not a positive result. To avoid confusion, always read your test within the time window printed on the instructions, usually around 5 to 10 minutes. Anything that appears after 10 minutes is unreliable.
What Can Cause a Wrong Result
False negatives are far more common than false positives. The usual causes are testing too early, using diluted urine, or not saturating the test strip long enough. If you get a negative but your period still doesn’t arrive, retest in two to three days. Your hCG levels may simply not have been high enough on the first attempt.
In rare cases involving extremely high hCG levels (around 1,000,000 mIU/mL), a phenomenon called the “hook effect” can actually cause a false negative. This happens because the excess hormone overwhelms the test’s antibodies, preventing them from forming the reaction that produces a positive line. This is almost exclusively seen in conditions like gestational trophoblastic disease, not in normal pregnancies.
False positives are uncommon but possible. Fertility medications that contain hCG are the most likely culprit. Certain other medications can also interfere, including some anti-seizure drugs, antipsychotic medications, specific anti-nausea drugs, and some progestin-only birth control pills. If you’re taking any of these, a blood test from your doctor is a more reliable option.
A chemical pregnancy can also produce a genuine positive followed by a negative a few days later. This is a very early miscarriage that happens within the first five weeks, before the pregnancy is visible on ultrasound. hCG levels drop by roughly 50% every two days after a chemical pregnancy, so a repeat test will show a noticeably fainter line or turn negative.
Blood Tests vs. Home Tests
Home urine tests and blood tests both detect hCG, but blood tests are more sensitive and can pick up smaller amounts of the hormone earlier. A blood test also gives a specific number rather than a simple positive or negative, which lets your provider track whether hCG is rising normally. If your home test result is unclear or you need to confirm a very early pregnancy, a blood draw at your doctor’s office is the next step.
What to Do After a Positive Result
Once you have a positive home test, schedule an appointment with an OB/GYN. This is especially important if you’re over 35 or have had previous pregnancy complications like a miscarriage or C-section.
At your first visit, expect a full physical exam and a review of your medical history. Your provider will estimate how far along you are based on the date of your last menstrual period. If you’re unsure of that date, an early ultrasound will be used instead. First-trimester ultrasounds are the most accurate way to date a pregnancy; accuracy decreases after that window. Your blood pressure will also be checked, since high blood pressure is one of the key risk factors monitored throughout pregnancy.
After that initial visit, the typical schedule is monthly appointments until 30 to 32 weeks, then every two weeks until 37 weeks, then weekly until delivery around week 40.