Reaction when baby is born

C
FTM!! I've never been the type to show much emotion. I don't really cry or show excitement, when i receive gifts it's like i don't know how to react, I've always had this problem and I try to get excited or show something in my reaction but it never works. 
Today my SO asked me " so you know how you have a hard time reacting, how will you react when our son is born"? 
I froze, I don't know how I would react. I probably would be too tired to react. I told him I would probably cry from joy he said no I won't because I don't cry and he called me a cyborg. Lol 
Seriously ladies what is the natural reaction after having a baby? Excited, tired, relief ?