Needing some input

A little background, I’m in my 20’s fiancé is in 30’s. we were living together but my collage was pretty far, and I didn’t want to wake my baby. So I moved in with my mother. Well my fiancé as I want another baby, and have been trying. Why do I feel so guilty? Once we get a positive I’ll be moving back out. Into our own place.. but why do I feel so guilty?! Nervous?! Advice. This is what I want.