Can a test strip detect after three days of menstruation?

Patient's question:

No

Doctor's answer:

Hello, a positive result on an early pregnancy test paper usually appears 7 days after a delayed menstrual cycle or 10 to 14 days after intercourse. Two red lines on the test paper indicate a positive result, meaning pregnancy. Additionally, a blood HCG test can be performed at the hospital 7 days after sexual intercourse.