When the fetus because more mobile in later weeks, sometimes it will hide because it does not like ultrasound
waves. If a woman has a tilted uterus, sometimes it will not show
until later weeks such as 11 weeks. That fact that you have a good hcg count, is a good indicator. It amazes me how quickly many doctors are to doom a pregnancy. It is horrible when women are at the peak of their emotions. I would definetely wait things out until at least 12 weeks. You are very very early.