How do pregnancy tests work?
Pregnancy tests measure beta-hCG, a hormone released after the embryo implants in the uterus. Implantation happens about 6-10 days after ovulation, and hormone levels roughly double every two days in early pregnancy.
Home test or blood test?
A blood test is more sensitive and can detect pregnancy 10-12 days after ovulation. For home urine tests, the most reliable time is the first day of a missed period. Earlier tests can be falsely negative because hormone levels are still low.
Pregnancy tests after IVF
After IVF, the test date is set by the treating center, usually 9-12 days after transfer. The trigger injection contains hCG, so early home tests can be falsely positive; a blood test is preferred.
Frequently Asked Questions
My test is negative but my period has not come. What should I do?
Repeat the test in 3-4 days with first morning urine. If it is still negative and your period is still late, see your doctor.
Does a faint line mean I am pregnant?
Usually it indicates early pregnancy. Repeat the test a few days later or confirm with a blood test.