Back labor?

Reggie

I’m 40+4 and waiting on my son to arrive. I’ve had a few contractions but nothing in a pattern and no more than a couple a day for the past week.

I just had the most excruciating pain in my lower back (center, right at the top of the back of my pelvis) that lasted for about 1.5 minutes. I literally dropped what I was doing and had to sit on the couch and bend over but that didn’t really help, it just dissipated on it’s own. My stomach didn’t tighten, though.

Could that have been a contraction or the start of back labor or did I just pinch a nerve in my back?