Worried!!

Mars
When I was 9 weeks saw a heart beat but yesterday on my 11 weeks got my ultrasound and didn't see a heartbeat and baby has not grown. Should I prepare myself. Dr requested to get some lab work done and will be seen in a week from now. Why ALL THE Hold up. I broke down on tears can't seem to stop crying..has this happen to anyone? This is my 11 week baby pic.