Lightening crotch

I’ve had lightening crotch probably 100 times in the last 8 hours. I know it’s usually a harmless phenomenon, but with having it every couple of minutes for hours, is that still normal? It’s quite painful..

31 weeks, baby is head down and very low. Ive also had a few Braxton Hicks today as well. But nothing like the lightening crotch.