Do I need to be concerned ?

I’m 36 weeks tomorrow. I woke up feeling a little funny today. My back has started to hurt pretty badly a few days ago. I get menstrual like cramps at least once a day for the past week. The corners of my pelvis feel like they’re being pulled on like taffy. My pee looked a little pink today (my eyes could have just messed with me) My vagina feels like I’ve had sex last night even though I didn’t. Like there’s pressure inside? My baby has been on my cervix for a while now so idk... should I be concerned or does this mean anything?