How come I feel pregnant but no sex? PLEASE HELP?

Chances to get pregnant this way are slim to none(closer to none). And all of those symptoms are quite popular even when you're not pregnant(I have all of those and I'm sure I'm not pregnant)... Maybe you ate something bad and breasts changing before every period so don't freak out. If you're still not sure are you pregnant or not(remember, people from Internet can't put a diagnosis) I suggest to go to a gynecologist. Once there ask him/her how you can get pregnant, how to use Contraception.