How pregnancy tests work, when to test, and accuracy

How does a pregnancy test work?

Urine and blood tests look for hCG, a hormone produced during pregnancy. Home tests are qualitative: they show whether hCG was detected above the test's threshold. A health professional may also use a blood test when more information is needed.

Each home test has its own directions and reading window. Check the expiration date, follow the instructions exactly, and make sure the control indicator shows that the test worked.

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When is a pregnancy test most accurate?

Testing after a missed period is generally more reliable than testing before it. The FDA notes that some pregnant people will not detect pregnancy on the first day of a missed period because ovulation, implantation, and hCG levels vary.

First-morning urine may contain a higher concentration of hCG. Drinking a large amount of fluid before a urine test can dilute the sample and make early pregnancy harder to detect.

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Can a pregnancy test be wrong?

A false negative means the test says not pregnant even though pregnancy is present. Testing too early, not following the directions, reading the result at the wrong time, or using diluted urine can contribute to a false negative.

If the result is negative and your period does not begin, repeat the test after several days or about a week. If two home tests are negative and you still think you may be pregnant, contact a licensed health professional.

A false positive is less common. Fertility medicines that contain hCG and some recent pregnancy events can affect results. A health professional can help interpret an unexpected result.

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What if my periods are irregular?

Irregular cycles can make a missed period harder to identify. The Office on Women's Health suggests testing about four weeks after sex when cycle timing is uncertain, then repeating the test or contacting a health professional if the result is negative and pregnancy still seems possible.

Symptoms alone cannot confirm pregnancy because fatigue, breast tenderness, nausea, spotting, and period changes can have many causes.

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What does a positive result not tell me?

A positive hCG result usually means pregnancy, but the test alone does not show where the pregnancy is located, how far along it is, or whether it is developing as expected. A licensed professional can explain whether another test or evaluation is appropriate.

Severe or one-sided abdominal or pelvic pain, shoulder pain, fainting, weakness, or heavy bleeding can be signs of an ectopic pregnancy or another emergency. Call 911 or seek urgent medical care for severe symptoms.

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Pregnancy testing in Vero Beach

Care Net offers pregnancy testing at no cost with a medical professional in Vero Beach. Requesting an appointment does not book a visit. The team will contact you to confirm the time and available service.

Care Net does not perform or refer for abortions.