Help! Support? Ectopic pregnancy?

Hello everyone, 
On April 1st my husband and I got a BFP. So we scheduled a obgyn appointment for yesterday (April 2), when he did an ultrasound, he couldn't find the baby. He said this may be an ectopic pregnancy or it may just be that I ovulated late and the baby is too small. I'm so worried, he's calling back around 10:30/11 am to let me know of the blood results. Has this happened to anyone else? Are there any suggestions out there? It would be much appreciated. Thanks!