So I gotta say I am a little freaked out right now and confused, and I'm sorry if this is a little long. My last ultrasound was at 12 weeks and they only saw one baby, and I've been using the Doppler once a week for about a minute, at most 2, and only picked up one. Today though when I used it I first put it on my right side and I heard a heartbeat which I found odd because my boy likes to be on my left side for some reason, so I moved the Doppler to the left and sure enough I heard his heartbeat, I moved back to the right and once again heard another heartbeat clear as day. I thought maybe it might be mine so I listened to mine just to be sure and it isn't, mine was beating slower than the other two. Could it be possible I have twins and the ultrasound just didn't pick up on it?