Can i still get pregnant if i had sex 1 day before my period?

Ovulation ; Periods: Nope. It is unlikely. You get pregnant when you ovulate. The menstrual period is the sign that the ovulated egg was not impregnated. Ovulation usually occurs just shy of half way through one's cycle. Every menstruating female should know the simple fact of when she ovulates.

althougth unlikely: It is best to use protection every time to protect against pregnancy and std's.