Normal braxton hicks?

Frankie

3rd baby girl, I’m 28+1 weeks and due 27th December, my baby’s head is right down and she weights 2.5lb so the dr says.

I get braxton hicks all the time, I mean like 20+ times a day. Real bad tightenings that when I get then they stop me walking etc. Is this normal for them to be so uncomfortable and have so many or am I going into pre term labour soon?