Well, my period was a month ago and I was due today. Typically I'm a day or so late because I'm an active soccer player. But in that month me and my boyfriend had sex a few times with a condom, we hadn't tried without and just wanted to go a few times but not enough to make him finish, because having a baby is the worst time right now. I've also read up about pre-cum and such like that. The only reason I'm really worried is because 1.) I always know my period is coming because the week before I have terrible cramps... this one has snuck up on me