Relationship forever..?

FarmWife 🌾 • 2015 👧🏼 2017 👼🏼👼🏼 2018 👧🏼 🌈 2020 👶🏼
So my boyfriend of 5 years never talks about marraige. When someone asks if we will get married he says "someday". He did give me a promise ring 2 Christmas' ago. We are only 21 and I don't see a point in rushing. Just makes me curious why he wouldn't be more prone to getting married vs having a baby? It was a planned pregnancy and due in July!!