Dear L.,
I had the same thing happen in 2005. Was so excited to be pregnant - per the pee stick, had no idea how far along I was as I am super irregular, only saw a sac at first ultrasound. I went out to my car and cried in the parking lot. The doctor said had me wait two weeks and then did another ultrasound. We had a heartbeat at that one. My son is almost 8 now! He is awesome and there is nothing "wrong" with him. He is a super cute and bright little boy that is a joy to all of us.
Say some prayers if that helps you and keep in mind that either the pregnancy will develop or it won't but there is absolutely nothing that you can do about it.
Sending prayers for a healthy baby and mama and positive vibes for health. C.