Period like cramps 35 weeks

So starting last night I had some period like cramps. They didn’t effect my back and went a way after a while so I figured it was fine. I’m having the same thing right now and so I got up and went to use the bathroom to see if it was just too much pressure on my bladder. Still having them but that aren’t unbearable and they aren’t around to my back. Should I be concerned or just kind of wait it out? I have an appointment on Tuesday and since it’s not too bad I’d hate to go in and it be nothing when I have an appointment less from a week today anyways