Menstrual cramping

So I'm 38+2 today and I have had really really really bad menstrual cramping. It's so bad it hurts to walk. I haven't felt any contractions but could those be it? I went in for my 38 week appt and the midwife told me I was 70% thinned but 0 cm dilated. Baby is in the right position so everything is going as it's supposed too, but has anyone else had really bad cramping? I've had it all day long, hasn't gone away and come back, it was just constant all day long!!! It's been painful. And I also have lower back pain like crazy. My mucus plug is coming out piece by piece! 
You ladies having anything similar??