Ooh, that's exciting that you're starting now! Whoohoo!

Just was going to add that unless you really want it, you don't have to stick with "Mum" - a bit different, but a friend's daughter calls her grandma "Emmy" which was a childhood nickname of the grandma. I thought that was a nice touch (the great-grandmother was still alive when my friend's daughter was born, and she was "Granny"). I'd understand if you both want to be Mum though, it's a bit of a special word

Welcome and best of luck TTC.