On friday I had really bad cramps. No worse than period cramps. They were right in the center of my pelvis, very low. At the same time I felt really really sick. No bleeding at all. I'm scared because I've read stories about women who didn't know they miscarried until they went for an ultrasound and there was no heart beat. I'm about 7 weeks. This is my 2nd pregnancy. Did anyone here or anyone you know every miscarry but had no idea until they went to the doctor?