I know it Sounds weird and it happens during actual labor, But most of the time when its not labor or contractions its actually gas!
I'm only 33 weeks but had this a couple days ago I thought it was the baby dropping but didn't know til I went back to work and everyone kept saying how low baby had dropped lol so maybe its that!!
Its not a cramp really its like in my butt lol tmi and its been happening right now too and im just sitting here
I have had the same problem and my OB said its bc u hold ur pee into long so after going to the bathroom your bladder is contracting which is causing you uterus to! Just keep and eye on it and if the cramping happens more then six time in a hour you should go to l&d at least that's what my dr told me but could be different bc I am pregnant with twins!