Jealous... is it just hormones

I’m pregnant with my first child and my partner is for the most part doing his best to be attentive and supportive but a few things are starting to get to me like the fact that he has his ex on Facebook still but to be fair he doesn’t actually talk to her but it still makes me feel uneasy and seeing him liking random girls attention seeking picture really pisses me off I think because I know my body is changing and I don’t look like those girls anymore I feel like I can’t compete with it, it’s making me crazy because I never used to feel jealous and now I’m analysing everything in a bad light,

Am I going insane or are my hormones sending me insane????