Hi doctor, i had unprotected sex for the first time on the 6th day of my period 7th march.(i was not bleeding that day).i took unwanted 72 within 12 h?

Possible pregnancy: If you had vaginal bleeding after you took the Plan B (or equivalent) then treat that as you period. If you are more than 7 days late for your period, check a home pregnancy test. If you are having sex and don't want to get pregnant, you should see a doctor to get on a reliable method of birth control. I also recommend having your partner wear condoms to help prevent pregnancy and STDs.