Ready for another baby

What do you do when your SO says he wants to wait a bit longer but you want a baby like right now lol? I'm really upset and he keeps hurting my feelings over it. To me it would make sense right now since I will be starting back at school in January. (We would have the baby like august or so... assuming we get pregnant right away). He wants to wait like 4 months which is too long for me, but would also mean I'd be getting sick during finals and such (if this pregnancy were like my last)

I can't cope and really don't want to wait a long time.