Sometime when I wipe?

So lately when I wipe sometimes there's a little bit of blood. Then other times there's no blood at all. I usually start my period on the 25 but the app is saying I'm starting the 29th and I had sex two weeks ago and he didn't use a condom. So I just wondering if I could be pregnant? Or not. Because I've had cramps but nothing like how I usually get them. My cramps are usually so bad that I can't get out of bed.