The probability of having a son is high if you test positive for pregnancy with a test just one day after your period.

Patient's question:

No

Doctor's answer:

Hello, after sperm and egg combine to form a zygote, it takes 6-8 days for implantation in the endometrium. Then, it takes 7-10 days for HCG secreted by the placenta to enter the urine. Adding these two together, it is scientific to test for pregnancy in the urine 18 days after intercourse.