Pregnant?

so I know most of you girls get annoyed by reading these but I just need some reassurance lol. I had my last period on Feb. 14th & me and my BF had sex on the 19th (roughly 2-3 days after my period ended). we used a condom halfway through but it kept coming off so we finished without the condom. he did pull out & finish on my stomach (he says he's very confident in pulling out in time). well anyways I know people say you don't know for certain when exactly you ovulate but I've heard that if your periods are regular, then your ovulation us too. I noticed a little over a week later that I was having discharge & im fairly certain I ovulated around the 27th of March. (I noticed the change in mucus when I would go to the bathroom & wipe). Anyways, I'm supposed to start my period in a few days & I'm cramping a bit. I'm just wondering if this is pre period cramps? Google keeps telling me I'm pregnant but I don't really think I am...I mean my BF did pull out & I wasn't even ovulating for another week. I was just hoping to hear some of your thoughts?? I think I'm just paranoid!