i has unprotected sex in september...my period came urlier than expected but it came off. i use tampons which really doesnt let me know if my period cam normal...all i remember is bleeding a little on teh first day. alot on the second and on the finishing and the rest of the four days i bleed spotting. in october it took a while for me to get my period this time it came in late a week late. and itw as the same as the other period. my menstrual periods never were like that in the first place so it trew me off guard.i started getting bloated and ive been having gagging problems. i cant eat in the morning because i wanna trow up. this month of november i had my period again but took a little longer. it was the same. 3 weird days and the other 4 were spotting. no later than the 7 days it was over i spotted 4 days after. i got worried because i do think im preganant but im not sure. my stomachs bloated. i gained weight. i have heaches. back pain,nausea, i get all these mood swings. i dont know whats wrong with me...i went to the doctor and the pregnancy test came out negative. do i have an std or something?