Can i ask something please.. be real with me even if it’s mean..

I just went through my boyfriends phone yess but for the first time since like 4 months been with him for almost two years. Just seen he’s screenshotting girls snapchats like the one that’s do the sex videos/pics i know you can’t talk to them unless you buy something from them and I’m 100% sure my bf is not buying pics from them. He’s been 110% faithful to me But I’m still a little bit hurt.. am I not good enough that he has to look at other girls pictures and videos?. I seen he had 3 snaps so i click the first it was a girls boob.. now that kinda hurt me because now I’m thinking negative. Than the second one was a guy!!!! just the side of his legs and a bit of his penis... I’m like ok so i screenshotted to ask him when he wakes up. Idk if it’s because I’m pregnant or I’m getting my period soon that I can’t stop crying bcause i feel so unworthy. I gained weight being with him i feel so fat... I’m 160 right now but my belly is like 15 weeks pregnant i swear. Please help me give me advice. Tell me I’m tripping be mean open up my eyes. Anything