Just found out 4 days ago!

Hey everybody, my girlfriend and I just found out we are pregnant. This will be the first child for either of us. I was shocked when I learned she was, but after that faded I've found myself more excited about this than anything ever before. My parents are thrilled to be first time grandparents, sadly her parents are no longer with us, but her Aunt and Uncle are with us and like her parents, and they are extremely excited. I know for advice and knowledge I'll look to my parents and our friends who have children. We are just so absolutely excited, and our first ultrasound where we get to hear the heartbeat for the first time is next week. My question here is dads who have been in the ultrasound room and heard the heartbeat for the first time what was your reaction?