My boyfriend and i had unprotected sex on the 27th (i’m on birth control) he didn’t get out in time and we are unsure if some went inside me. i started my sugar pills on the 28th and usually get my period by monday or tuesday. it’s tuesday and only a little blood has appeared. should i be afraid? should i call my doctor about getting a pill to make sure nothing happends i read you need to take the pill before 72 hours and 72 hours is today.