I have that too! My ob says it's just my body getting ready for labour but if it's really strong or makes you think twice to go get checked out cause it could be the start of labour!
I thought it would be but its a constant cramp it doesnt come or go its just there almost like right after getting mirena put in or the first few days of a heavy period but no blood... then ill get a sharper pain on and off which i think is the braxton hicks part but i cant figure out what the constant cramp is.
It could actually ne braxton hicks. I had painful ones as well.....we seem to be a minority, but it does happen.