masturbating to people i know

okay. so I have always said its a okay to masturbate. its healthy. but i tell my husband to never ever do it to people we know. idk i find it hurtful if that happens. but lucky me. i walked in on him rubbing one out laying in bed and he was on Instagram feed. when he saw me he got scared, put it away, and scrolled real fast. for some reason i wanna know who he was masturbating to. ive asked him but he wont tell me. do i have the right to be upset? im also 23 weeks pregnant with our first. granted now that im bigger we dont have sex frequently. but we just did it friday night. but thats what porn is for. im just hurt 😔