I Had Started My Period On December 10th. Then Had

I had started my period on December 10th. Then had unprotected sex the next day , my period wasn't heavy at all . I had ate lemons , and it made my period stop. I had unprotected sex that whole weekend , my husband didn't cum inside me..im sure of. Ive been feeling bloated for a week already and my back has been cramping. I've been feeling like I have to throw up sometimes , my mood swings have been kind of crazy. Today had been the 12th day after I had sex.. Is it possible I can be pregnant?...