Really want a baby!

So
I've only been with my SO a few months, so it's not going to happen any time soon but we've been super close since the beginning of the relationship and lately we've had some really serious convos about planning our future...
I've never really been interested in babies but he told me he definitely wants a family. 
This has made me insanely broody for some bizarre reason and I can't cope! 
What on earth am I going to do with myself for the next like three years?? 
(I have the implant until I'm 28). Seriously ... I know it's totally ridiculous but I can't get over this feeling. I find myself staring at him when he's not paying attention and wondering what colour hair our baby would have 😂. Please help. Am I insane? Lol