pumping for cervix ripening...

Amanda
pumping for 15 mins, one time each side. and my belly gets really hard. no contractions. not even bh. but after the first 10 mins, besides my nipple getting bigger then the size of my boobs... my belly gets hard for least 5 mins after stopping. but again. no cramps or contractions. why is this? 37 weeks btw. and being induced at 39...