Me and my fiance had sex on my most fertile day, but I can't remember if we did the day before or not. I have been nauseous, tired all day, have very tender breasts, head aches, and abnormal bowel movements... I also usually cramp 3-4 days before my period but haven't cramped yet except a week ago and my period is in two days. Is it likely I'm pregnant or just experiencing "pms" ?