I have been feeling nautious and vomitting almost every time i eat the last few dayds i also have been extremly moody and irritable for no apparent reason, i have had unprotected sex and the only "method" of bc we used is the withdrawl method which i know

Check preg test: Unprotected intercourse without backup birth control followed by nausea and vomiting and moodiness...Next step if to check a home pregnancy test. If positive then there is your answer. If negative then primary care doctor would be your next stop. Also if you do not want to be pregnant see your doctor to begin more effective birth control.