Do I have a right to be upset??

So I know it’s not a big deal that guys watch porn. I’m currently 21 Weeks pregnant so if I don’t feel like giving my husband any it doesn’t bother me when he takes care of himself. But recently even after we have sex and he thinks I’m asleep he will pleasure himself. It just makes me feel like I’m not enough for him... it’s all I can think about.. I don’t know if it’s just my pregnancy making me upset or if I actually have a reason to be?? It’s just an awful feeling crying about it to myself every night. Anyway I just needed to vent somewhere..