Hey Cait!! I know that it is impossible not to worry but you should feel really good about seeing the heartbeat. I had an u/s with this little bean right at 7weeks 6 days and we were only have to see the heart fluttering and not yet hear it. I think it is still to early to hear it. Luckily you only have to wait 2 weeks to go back. I had to wait 4 weeks, but by then I was 11weeks 5 days and we were able to hear the heartbeat with the doppler. Don't get discouraged. Stay positive and everything will work out for you.