Pregnancy...

This month I let my boyfriend cum in me on the 15th when it was in the middle of a no fertile period... I was suppose to start my period yesterday... But I'm on the pill and when I start taking the white pill mean I'm going to have my period that week it differs between 3 to 4 days when I should start my period... So I should either start yesterday or today... I'm a little nervous i don't want to be having a child at this time with college starting up. Ik it wasn't smart to let him cum in me either it was a spur of the moment thing.. But I've also be very stressed out lately to.. So what should I do...