Can't start ttc for a long time and it's killing me :/

Hi ladies, I am 29 years old and recently engaged , I've been with my fiancé for 4,5 years. For many reasons we won't be able to start ttc for at least a couple of years and I can't handle it. It seems too long to wait , considering that conceiving can take a long time.

The rational me says that the right thing to do is to wait.

The other part of my wants a baby now.

Maybe because we haven't set a wedding date yet I feel like everything is still up in the air.

I'm hoping to get married 2019 because 2018 seems too soon for my fiancé , considering we will have a new business together by then and everything will be a little hectic.

What can I do to help my self when I feel like it's too long to wait ?

Thank you in advance