baby fever

Hey! I wanted to know how young everyone was when they started getting baby fever? There's been a few times where I've had it fleetingly but lately it's been bad. I'm 21 almost 22, so it's pretty weird to me how much I want a baby! I'm a premed student and I really don't wanna wait until i'm done with medical school to have a baby! Am I going crazy or did y'all have baby fever this young?