I had been reading up on the internet about pregnancies that were false, I hadn't heard of them myself either but I was reading that it is quite common for women to feel all the symptoms of pregnancy but have an empty sac, with no baby/embryp inside it. This was known as an empty sac pregnancy, it results in misscarriage. In early scans ther may be no sight of a embryo or beginning of a baby but sometimes in later scans the embryo can appear and the pregnancy is successful. You should try looking it up on the net it is shocking some of the stories, but it can happen?

Hope this helps
marie xxx