well last week i had my period its always irregular but i started taking birth control like 5 months ago any way i had sex on the 26 of july and again on august 4 and 5 . i had my period a few days after i had sex july 26 after it went off i had sex on august 4 and 5 and had another period after aug 4th and 5th . . . when it started i was feeling sick in the morning and really tired i thought it was just the start of going back to school but now a week later im having this light brown spotting and i feel like im about to throw up in the morning and after i eat like yesterday i almost threw up my lunch and when i came home from school i stayed in bed until it was time for me to go to church and when i came back i ate and went to sleep i dint really have energy to do anything else . . . dose anybody know what all this is ?