Is it possible?

[gothbarbie640]

I was supposed to start my period last Friday June 30th. I had unprotected sex on the 27th but we had drank a little, him more than I, and he couldn't keep it up as long as usual. He did not end up ejaculating that I could possibly tell. My period is a week late. I've had sore breasts and cramps like it was going to happen any day but it still hasn't yet...is it remotely possible I could be pregnant? Like if there was pre ejaculate or something? Now I do have really weird unpredictable periods that can be often late and I always have sore breasts, awful cramps, nausea, but they usually aren't more than a week late. this is the first time I've had unprotected sex and I get paranoid...anyone in a similar situation?