Planned baby before marriage?

My boyfriend (of 5.5 years, living together for 5) and I have decided to start trying to get pregnant. We’re not particularly interested in marriage at this point, we’ll probably go ahead and do it as some point, but would rather hold off for a bit for several reasons. We’re early 30s, financially stable and have always planned to have a family, agreeing that he’ll be a stay at home dad as I’m much more invested in my career.

Wondering if any of you have done it this way? Checking the baby box before the wedding box on purpose? Anything you wish you had known? Any advice?