could i be pregnant!?!?

so about two weeks ago af came and towards the end of it it would stop and go so me and my bf had sex when it was stopped is there a possibility that i got pregnant and could be pregnant now and feeling nauseous and puking out of nowhere?!? also every time i eat i either puke or almost puke when i think of food i feel like ima puke and when i smell it or see it i almost do. help plz idk what’s happening.