Symptoms So Soon?!?! Please Help! Lots of ??s

Its very basic. I take my birth control pills whenever I remember them. Every day usually though. Sometimes may forget one and double up the next day. Not good I know. I wasnt planning onhaving sex but I did one night with my ex. Anyways... At this time I was taking my pills but careless about them and I was onthe pink ones (where you have your period) after we had sex (a few days after) I didnt have a normal period as I continued to take the pink pills but I did have cramps, a full day of period type bleeding ect.. And a few days of sotting but some days nothing for the full 7 days of the pink pills. The past 4 nights I have had 'night sickness' if you will. I mean flat out nausia. I was pregnant once before and I felt the same sickness but in the am not at night? Am I streessing it so muchim making myself sick?! I also feel like im fatter? Keep in mind we had sex almost a month ago. Im not I have weird cramps every now and then. Not like period cramps but something else. I dunno? But there is no more nightime sickness really but I still feel more bloted or fatter then normal. Ican tell by theway my body looks in the morning. Not as skinny feeling. Could I be pregnant? Its not yet time to take a pregnancy test. I have actually missed a period yet and like I said I have been pregnant before, and do not want a baby by my ex by any means so I am stressing this alot and maybe building it up in my head but is any of this normal? The way I beld, the cramps, the nausesa? Someone please give me some advice because I cant tell anoyone else andi need some sort of sense of comfort on way or the other. Not sugar coted either!! Please help!