freaking out!!

Ok so I'm on BC and I had sex about a week ago or so and I let him cum in me and I'm really paranoid. So I've been feeling super bloated and I'm really gassy. But I have been eating a lot of junk food and I mean A LOT and at one point it hurt to pee. And I haven't been drinking a lot of water. I've been so stressed 😔 any advice?! And I read online if your gassy about a week after that could be symptoms any advice helps