moving?

On Wednesday, which was 16 weeks for the little one, I was lying on my side resting because of a pretty bad headache and I thought I felt it move.  It was different than anything I've felt.  It was like I was being poked from the inside.  There were two pokes in the same spot and then a third a couple seconds later in the same spot.  I haven't felt anything like that since though.  I'd like to think that it was the baby.  Dave's excited for when he can feel it moving.