I am 8 weeks pregnant. When I went for my first u/s they could only find a sac so they took my hcg levels and had me go to a hospital for another u/s. My hcg levels were 20,000 and two days later 24,000. They had a very hard time finding the little one and when they did he/she only was measuring 5 1/2 weeks (at that point I was 7 weeks 1 day) and the heart rate was only 70. The Dr. said this was low, but that it could shoot up in a weeks time.They suggested another u/s a week later. Does anyone have any experience with this? The waiting is horrible!