me and my guy friend have unprotected sex on feb 17 a day before my period start on feb,18 it lasted about 4-5days. my regular period only lasted about 7 days. would like to know if there's a possibilities that i could be pregnant?
Chances are almost zero that you'd become pregnant.
Having sex within about 10 days before your period is due, the egg is not viable, so you are unlikely to conceive.
You were at your lowest fertility a day before your period.
Hope it helps.