Seeing Double?

We had originally chosen to keep the news private, but after only a few days.. I admit I spilled the beans! I just couldn't keep it in any longer... it just slipped out in a weak moment. :o) Dr. Miller is not 100% sure if we are pregnant with one baby or two. During our ultrasound last Monday, he kept "finding" a second amniotic sac, but it appeared to be empty.. no sign of a baby, no heartbeat. He seemed to think that the ultrasound equipment could have been showing us kind of a mirror image. But, as he kept going back to the spot, it kept appearing... so he couldn't rule out the possiblity of twins with one being still too small to "see." We will have a repeat ultrasound on Friday afternoon that should give us a definite answer. We are excited either way.. we just want a healthy baby/ babies?!