what is going on ?

March🕉
I'm 37w3d ftm and just today I started feeling pelvic pain almost like a tightening and squeezing that makes me wanna take a poop 
I'm timing it since 2pm today. They are 10 minutes apart and last 50-60 seconds. They take my breath away to the point that l get on all fours on my carpet 
It's NOT contractions right ?