My boyfriend and have been having sex quite frequently this month and it was all protected except at one point he did put it in unprotected a few times, but he tried to make sure it was clean and it wasn't in but for a few seconds each time. But my period was a week late. Today though, I did start bleeding. The bleeding is MUCH lighter than normal. I have only seen a few spots of it on the tampon and none of it leaks into the toilet. My lower back is also cramping a lot, which usually happens when i'm on my period. I would just like some advice on if I could be pregnant or if this is just an extremely light period. Please help.