Braxton hicks with bicornuate uterus.

I'm 23 weeks and I have a bicornuate uterus and I think I'm getting braxton hicks but its only on my lower right side (Baby is on right side) My belly doesnt really seem to tighten but it feels like a painful cramp that comes and goes for about 20mins, almost to the point that I could cry. Its happened 3 nights in a row when I've laid down to sleep. Any advice or reassurance thats its BH?