Hello! I just wanted to say, that I know how you are feeling...sort of. I haven't had to have a d and c, but had a harder time getting preg this time compared to my first. This time I also had bleeding at 4 weeks. I thought I was miscarrying. I bled for 8 hours straight, and hard. Very scary. I was sent for blood tests, normal...then an u/s at 5 weeks. They too saw a yolk sac/egg sac, and could even tell me which ovary I ovulated from (neat). Okay, so they claim that that is completely normal at this stage. They said they would have been very surprised to see anything more than that. My doc sent me for another one at 7 weeks to make sure there was a heartbeat. You could see it clearly on the u/s. So, i would make sure she is at least 7 weeks to be sure you can see that. The tech also pointed out the head and said that is about all you should be able to see at that point. So, to answer you, your wife is totally where she should be. Next time, you should see a heartbeat and what they call a fetal pole (which is bascially the baby).Good luck. I am sure you will have a nice healthy baby. I am now 20 weeks and preg with a boy (girl last time) and doing fine.