it sounds like a missed miscarriage if your dates are correct. this means your body has not yet picked up the fact your baby has not developed correctly. they will probably book you in for a D & C, medically removing the feotus. if you were about 6 weeks or under it is too soon to see a baby or heartbeat. your doctor or ultrasound tech should have told you this. i am sorry for your loss but i hope this is not the case. i wish you the best of luck xo