 [ Symptoms ] my bf and i had sex 228 got period 31 it came early i feel crampy and have back pain coukd i be pegnant [ Disease ] yes in a short and simple answer its very possible when u say it was early how early because if u had sex in your ovulation time its possible ur having a baby if not then it possible that the sex brought on some bleeding i would wait a good week and take a test and try to be awear of your body if u notice differences then it can lead more to u being pregnant if not it possible u had some breakthough bleeding its normal to sometimes bleed early was it heavy or light brownish the back pain n cramping are also signs of implantion the embro sticking to ur uerus if ur hoping for a baby i wish u luck n it sounds to me like u may b having one of not i hope everything ok <positive_smiley> hope this helped u