That sounds like how I felt when I was constipated during my third pregnancy. You can take Maalox according to package directions and you should go by the end of the day, if you still have cramping after that I would call the OB. Maalox is safe during pregnancy. That is what I had to take on a dialy basis to prevent constipation!
Heidi - wife to John and SAHM to Andrew 9/4/96, Liz 12/4/98, Caleb 9/2/03, Aaron & Glory 10/20/05 and Madison 12/5/07 VBAC (born in the water!)
Sun City Babywearers co-leader