Seeing Double

We went in for an ultrasound after having a little scare.  We were worried something was wrong but the ultrasound tech pointed out the heartbeat right away.  Then she pointed out the second heartbeat.  I sat straight up and looked at Mitch and said "Mitchell what did you do?!?"  haha...I don't think the ultrasound tech knew how to respond to that.  Neither of us have twins in our families.  We are very excited but also very nervous!