Normal?! help!

Br

So I'm almost 20 weeks pregnant, last night while getting out of bed to go pee I had a very tight cramp like on my right side of my abdomen that I could feel all the way down to my lower back, (almost like a Charlie horse feeling) and then after 5 minutes or so it went away but I got it again at like 5 am the same exact thing....anyone know if this is normal or should I call my dr?!....