How Does a Pregnancy Test Work?

March 27, 2026

That moment of waiting, whether you’re hoping for a positive or dreading one, can feel like time standing still. If you think you might be pregnant, you’re probably looking for answers you can actually trust. Understanding how pregnancy tests work can help you feel more confident about when to test, what your results mean, and what to do next.

At Nova Women’s Health, our medical team offers lab-quality pregnancy testing in a supportive, professional environment. No matter what you’re feeling walking through the door, you’ll be met with compassion, accuracy, and care.

Schedule an appointment today.

The Hormone Behind the Test

Pregnancy tests detect a specific hormone called human chorionic gonadotropin (hCG). Once a fertilized egg implants in the uterine wall, typically between 6 and 10 days after ovulation, hCG production begins, and levels double every 48 to 72 hours.

Testing too soon can result in a false negative. If hCG levels are still low, a pregnancy may not be detected on a test. For the most reliable result, it’s best to wait until after your first missed period and to test with your first morning urine, when hCG levels tend to be most concentrated. If your test result is negative but your period hasn’t started yet, it may help to wait a few days and take another test.

Blood and Urine Pregnancy Tests

Most pregnancy tests use a urine sample to check for hCG. These are commonly used at home but are also available in medical settings. At Nova Women’s Health, you can receive lab-quality pregnancy testing from trained medical staff for more dependable results.

In some cases, blood tests measure the exact level of hCG in the bloodstream. These tests are performed in a clinical setting and can detect pregnancy earlier than urine tests.

How Accurate Are Pregnancy Tests?

Pregnancy tests are about 99% accurate when used correctly, but results can still vary. A false negative can happen if the test is taken too early or if hCG levels are still low. While less common, false positives can occur in certain situations, such as following a recent pregnancy loss, when taking certain fertility medications, or when an underlying hormonal or ovarian condition is involved.

If you’re unsure about your results, taking another test or seeking a professional evaluation can help provide clarification.

What Comes Next After a Positive Test

If your test is positive, there are important details to confirm before making a decision. Nova Women’s Health offers limited ultrasound services to help determine how far along you are, whether the pregnancy is located in the uterus, and if the pregnancy appears to be progressing.

This information can help identify any potential health concerns, such as an ectopic pregnancy or miscarriage. Limited STI testing and treatment are also available, which can be important for protecting your reproductive health.

A Supportive Place for Your Next Step

You do not have to navigate this alone. At Nova Women’s Health, our medical staff is available to support you. Whether you’re seeking medical information or someone to talk to, you are welcome here.

If you are looking for answers and support as you make your decision, contact Nova Women’s Health today. Request an appointment and take a step toward clarity, care, and confidence.