My boyfriend and i had unprotected sex a week after my period for only 5 mins, is there a chance i could get pregnant?

Yes : The length of time you had sex doesn't matter. Unprotected sex carries a pregnancy risk.

Yes: If you have a regular period, your ovulation occurs about the 14 th day of a 28day cycle. The released egg can live2_3 days. If have aperiod of 3 or more days tha will get you in the possible range of conceiving 1 week after menstruation remenber sperm can survive upto 2 days after sex.