I’m going crazy 😢

I am 21 weeks pregnant and have been struggling with these crazy thoughts for weeks and weeks! I think it’s my hormones but don’t know how to make it stop. I keep thinking that my boyfriend is having an affair or cheating on me. I have absolutely no evidence as I haven’t looked through his phone or computer, and I keep paying attention to little things that I would once never pay attention to. Anyone else deal with this? How do you get over these thoughts and feelings! It’s driving me crazy!