Masturbating while pregnant??

Ok so I've made this post anonymous because as childish as it sounds it's kind off embarrassing for me lol. Anyway, Is it ok for us pregnant women to masturbate? Lately I've been so horny and I'm kind off going thru a stage where I'm feeling really insecure so I don't want my fiancé to touch me so I'm sorting myself out.. but everytime I orgasm I feel my baby curl up and plant himself just under my belly button and he's so visible. I can't really explain it but when I touch my tummy I can literally feel him just lay there. I feel so awkward writing this and kind off disgusted too, but my main question is am I hurting my baby or squashing him? I'd never forgive myself😔 I'm 26 weeks also!