Baby sick

My bf and I have been together for 3 years. We own a house together, Pay bills together and do all things married couples do minus the paper that says we are married. He is perfectly content with his life....I on the other hand want to get married and have a baby. I'm 27 he is 28 and I have a 5 yr old daughter from and previously abusive relationship, it took me 2 years to even think about wanting these things with My bf because of previous trama. How do I go about telling him I really do want to have a baby without sounding like I'm desperate or wanting to force him into it... We ALWAYS have protected sex, and when we don't he makes me take a morning after pill..... help please?