Possible twins??!

Jamie

On Tuesday, my husband and I went in for our first Ultrasound measuring 7weeks 3 days and the baby had a healthy heartbeat! The doctor then stared at the picture for a while and couldn't decide if the second figure underneath it was the yolk sac or a second baby. We're going in for a follow up Ultrasound in a week and a half to see for sure. Does anyone have any experience with this? Could it actually be twins?