Can you have ONE Braxton-hicks contraction?

Mary
I feel like I just had a BH contraction. I am 16+1. Before I was pregnant, every once in a while, while having my period, I would get a quick but particularly bad cramp, like literally my vagina was cramping and releasing.  Today's cramp felt pretty much like that. I'm not concerned, per dr, I just want to be able to identify what's going on. Any advice?