Depending on the kid of birth control you were on and for how long will depend onthe kind of withdrawal you will experience. It may take a couple of cycles for your system to return to "normal", but in the mean time you may still be able to get pregnant. and If you do become so you may find that you are reacting alot the same way, since women respond differently to pregnancy too. Don't be afraid to call the dr. to ask questions. A phone call is free and they may be able to give you some answers over the phone.