Is it reliable to do a blood test after 11 days of cohabitation during the safe period?

Patient's question:

No

Doctor's answer:

The blood HCG test 10 days after the first sexual intercourse can confirm whether you are pregnant. You can do the test at the appropriate time based on your sexual activity. Additionally, if your menstrual cycle is usually regular, occasional delays or advances of one to 10 days are normal, and you can wait a few more days to see.