Extremely painful cramp after orgasm

So I’m pretty horny, even now in the third trimester (33 weeks) . My boyfriend ain’t too into the whole bump situation so I haven’t had sex in about two months now. But a girls gotta do what a girls gotta do - I just masturbated with a vibrator (only clitoral) and after the first orgasm I was fine but I didn’t feel done so after a quick scroll & recovery after the first one I was ready to go again.

Now I’ve got a full on cramp in my lower right tummy, it’s consistent and I don’t have braxton hicks, but I feel like I’ve done something I shouldn’t have done ? It’s BAD. Should I stop masturbation altogether at this point since my body reacted this way or what? I don’t have any other issues to take into consideration.