A positive pregnancy test usually occurs approximately four weeks after the start of the last menstrual period.This is the fourth week of pregnancy.Pregnancy tests determine whether or not a woman is pregnant by detecting the hormone human chorionic gonadotropin (hCG) in the urine.This hormone begins to be produced after implantation of a fertilised egg in the uterus.Implantation usually occurs about two weeks after the start of the last menstrual period, i.e. about 6-12 days after ovulation.
Therefore, a positive pregnancy test result is often obtained a few days to a week after implantation, which is around the fourth to fifth week of pregnancy.However, as there are individual differences and implantation may occur a little earlier or later, it is recommended that a doctor is consulted to obtain more accurate information, even if the test result is positive.
If you are considering a prenatal paternity test (NIPPT), there is a two-week consideration period after the pregnancy is known, which is sufficient time to think about it. If you are still unsure after reading the website and other information, please contact Hiro Clinic.
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Supervisor of the article
Dr. Hiroshi Oka
Graduated from Keio University, Faculty of Medicine
Doctor of Medicine
Medical Doctor