Went to the doctor on Friday and was sent for a ultrasound to check on baby because I was having back pains. After the ultrasound the doctor called to inform me that there wasn't a heartbeat and I'm scheduled for another one Tuesday. I'll be 8 weeks then. But I had a ultrasound done when I was 6weeks 1day and we had a heartbeat of 120. I haven't had any obvious signs of miscarriage other than some mild cramping and the continued back pain. ( I've had back pain prior to my pregnancy) I've got two healthy children and this is our third pregnancy. I've not got a history of miscarriages so I'm extremely nervous as to what is going to happen. What are the chances of hearing the heartbeat when we go Tuesday? I was previously told I had a tilted uterus with my last pregnancy if that means anything. Thanks.