Braxton Hick, Contractions, or just Pinching ?

Hi yall im 37 weeks 5 days and today I started my morning feeling fine. Up until about two hours ago. I started feeling this intense pressure more than usual behind my pelvic bone. Also feel tight pressure like pinching near my kidneys and in my lower stomach. I have to shift and I'm done sitting unless its on a toilet. Honestly the front feels like stronger menstrual cramps and it keeps happening then going away every like 10 minutes or whenever I sit. Im just curious if this could be the start or just gotta push through. Laying down and standing help a little but that feeling still comes back. FTM sorry if this doesn't make any sense.