Probably just paranoid but still..

Okay so I've been getting a little more belly then normal and I've actually went from around 107lbs to 103lbs and idk I'm just wondering if it could be the beginning of a baby bump or just extra chub I guess. And no my bf hasn't came in me but has pre came a lot in the past like month and a half or so but I'd think I'd have symptoms if I where wouldn't i? The only thing that has changed besides my stomic was my boobs got bigger and I have faintish veins now that I've never noticed before ha.