ok heres the problem in oct around the 23 i had unprotected sex alot of times and im on birth control but i have been missing pills so i have been doubling up like the book said i was still having sex in between i didnt start the new pack on time like the book said then when i started the new pack my period came dont know the exact day i just remember it being on for hallowen which is around my normal time now its nov i have three white pills left of the pack and still did not recieve my period does this mean i can possibly be prego or becaus eof the pill mess up my cycle is thrown off or was the bleeding i really had withdrawal bleeding and not my period please help