Well this is why i ask. After my period i had alot of unprotected sex with my bf, the whole month after. I never got my next period... Took a test and im pregnant. Would i be pregnant from after my last period or before. Its cause that period was alittle lighter than usual but did last a few days... Plus we did it while I was on one of the last light days of my period... I know i sound dumb asking this i just need to know so i can have an estimate of how many weeks because i have an ultrasound next week! :-)