Pregnant?

Okay so my boyfriend came home on leave over the Christmas holiday and we had sex, everything was fine I got my normal period on the 26th of December and then we took a trip and had protected sex. As far as we know the condom didn't break. I'm supposed to start my period today and I've been bloated and cranky, and I also have a kinda brownish-white discharge. I'm sure I'm psyching myself out, but what do you guys think? Thank you