HELP I don't know what just happened!!

So, I was just sitting at the computer when all of a sudden I feel a cramping in my lower belly, then it starts to feel crampy in my lower back as well. At first I thought maybe I needed to use the bathroom but after sitting on the toilet for a while nothing happened except that I could now feel the cramping from my belly and back in my thighs! It was a constant cramping too it didn't come and go lasted maybe 30 minutes and then it just stopped completely. I am 35 weeks and 4 days pregnant with my first and I have no idea what just happened, anyone else experienced this or know what it was? Any advice is greatly appreciated!!

Contractions. Time them. If they're regular, call the on call doctor.

Sounds like a contraction

Possibly Braxton Hicks?? As long as you have no bleeding or weird discharge and the cramps do not come and go regularly, like you'd expect contractions to, I would say that's what's going on. If you feel it again pretty soon, that could indicate labor, so I would just pay attention to your body and try and relax in the mean time (which I know is much easier said than done!)