What comes first? The baby or a ring?

My boyfriend and I have been together for 3 years now and we've recently started talking about having baby. I'm ready and he's ready and we're currently trying. We want one really badly.

However, I brought it up to some of my girlfriend's and they said I need to get a ring first. We've talked about marriage and it's not so much a question of if he'll ask but when he'll ask. We're just not in a hurry to have a wedding yet even though we both want to spend the rest of our lives together.

Should I stop trying to get pregnant until he pops the question??