Home pregnancy tests detect hCG, a hormone made after implantation. They are most reliable from the first day of a missed period. Early-result tests can detect lower hCG levels a few days sooner, but a negative result before your period is due may be too early. Using first morning urine helps early on. If you get a negative test and your period still does not come, test again in a few days and talk to a doctor.
Timing matters more than the brand of test.
Timeline
| Timing | What to expect |
|---|---|
| Before a missed period | Early-result tests may detect hCG; negatives are less reliable |
| Day of missed period | Most tests are highly accurate when used as directed |
| A week after missed period | Strongest result |
Getting a reliable result
- Read the instructions; reading times differ.
- Use first morning urine if testing early.
- Do not read results after the stated time window.
- Check the expiry date.
Next steps
A positive result is worth confirming with your doctor or midwife, who can begin prenatal care.
Tracking cycles? See ovulation tests and basal body temperature. Compare pregnancy support belts. Browse pregnancy.
Common questions
Can a test be positive and then negative?
Yes, this can happen with very early pregnancy loss. Talk to your doctor or midwife.
Do digital tests work better?
They detect the same hormone. Digital tests show a clear word or symbol, which some people find easier to read.
What is a faint line?
On most line tests, any visible test line within the reading time can indicate hCG. Follow the instructions and retest if unsure.