Period was march7 i had unprotect sex on march18 threw march22nd i feel nauses my breast hurt i feel like spitting a lot nd hungry a lot can i be prego?

May not: This may all be unrelated to pregnancy. Nonetheless you should be evaluated because if you had unprotected intercourse this could be related to infection. I would wait and see if you miss a period before doing a pregnancy test.

Could be....: Unprotected sex, particularly mid cycle is an excellent way to become pregnant. You should know that. Also what about protection from std's. Go get a pregnancy test at the drug store. Good luck and use better judgement in the future.