Thanks for the comments it doesn't seem so bad now i'll just have to wait
I agree totally with Jen. The heartbeat starts anywhere from 5 1/2 to 6 1/2 weeks. My new OB doesn't like to do them either until 8 weeks. I just had one early primarily for dating purposes. We didn't know how far along I was. I have met women here who saw the hb at 5 1/2 weeks, others not until 7 weeks. The fact that there was appropriate growth between ultrasounds is a good sign. With my losses, not only was there no heartbeat, but the growth in between was not the appropriate amount. The waiting is the hardest part, I know. Hang in there and try to stay really busy for the next week. I wish you all the best.
I too hear variations on the same theme but I'll tell you what my re says: she won't do u/s's until at least 7 weeks. She says by then the heartbeat should be clearly visible and measured & should be at least 110+.
You're in the waiting game - it sounds like your pregnancy's progressing but w/out seeing everything it's hard to gauge if it's viable or not. Knowing that the gestational sac/yolk are growing are very good signs - stay optimistic! - jen