Am I pregnant?

Ok so my period is due in a couple of weeks but when my last period ended I had sex literally the day after using the withdrawal method. Recently my tummy has become bloated and I've been having period like cramps I keep eating and I'm really tired. I also have super sore boobs they feel like they're bruised. My boyfriend and I are really scared since what we've read online all leads back to pregnancy. I've had a UTI recently but we don't think it's linked to that. Could I be pregnant? Or does it just link to the UTI?