How do you ladies deal with jealousy?

I’ve always had pretty low self esteem to begin with but now that I’m on my third trimester I feel gross and undesired which I realistically knows it’s true because my husband loves me very much and always makes it a point to tell me how cute or beautiful I am.

Lately I feel even more insecure than usual to the point where I keep making up these stories in my head about he’s cheating on me or will cheat on me in the future.

Part of it is fueled by my own insecurities but I feel like part of it is also some secretive behavior I’ve noticed on his behalf... like always keeping his phone on him and freaking out if he sees me with it.

This week he has been texting an ex coworker who was just checking in on him and I flipped my lid because I noticed she had a contact picture (a very cute selfie) which he doesn’t have any contact pictures for anyone on his phone and that honestly triggered me because that means he either took the picture or for some reason this chick is sending a married man selfies and he thought it was cute enough to use as her contact pic....

Idk I know that part of me is overreacting and I shouldn’t be making this big a deal but then why is he acting all shady and why did he put that picture of her as her contact photo? :(

I think these last trimester hormones are driving me insane and idk what to do.