Pregnant?

So, my boyfriend and myself are both 16 and definitely not ready for a child. We had protected sex on Friday but while we were, the condom slipped off. He had checked it just 20 seconds before so It didn't happen for very long. He hadn't cum yet either, but I know there has been evidence of viable sperm in precum which there was some of that in the condom. My period was scheduled to come on Monday but hasn't come yet although I've been feeling all of the signs it is coming. Do you think I'm pregnant?

Update: My period came :)