my period isn't due for maybe about another week. i had unprotected sex on the 8th of january & the 11th. the 8th i'm not so sure of anything getting in as far as semen but on the 11th i'm defiantly sure. i took a take home on the 10th of january & it was negative. on the 12th i took a blood test still negative. my back & head hurt quite frequently..although i haven't slept much. i pee every 20 - 30 minutes, it was so bad i almost peed in my sleep the other night. i've had slight bleeding but is on & off for the last three days. it is also way to light to be a period.