Masterbating

How many of you ladies are okay with your boyfriends masterbating to porn? I'm pregnant so we hardly ever have sex because my belly is in the way & I'm just already so uncomfortable. I've never really liked the fact that he masterbates. I haven't caught him doing it lately but I feel like he wants to. I'm not okay with it because well he's getting off to other girls & not me. Just want your all's opinions!