Oh, congratulations!

We picked out a Isabelle with DD, but thought she was going to be a boy so didn't really get fussed on girls name. DH had a boys name picked out for YEARS and so we just chose that and his middle name. Then about 18w when we were on holiday in Bright DH just turns to me and says "What about Hannah?" And I shrugged and said "Yeah OK, but it's a boy." And DD has my middle name as her middle name too.
Isabelle was so popular at the time, too.

With DS, I had picked a girls name. When DD was in NICU there was a little girl in Room 2 with DD who's sister was Tallulah and I fell in love with the name, upset I hadn't heard it before DD was born.
A boy's name was harder. We chose Cody, then changed it to Coby, then Colby. And we were looking at a metal magazine that had an interview of our favourite artist (Corey Taylor of Slipknot and Stone Sour) and DH jokes "What about colby ta yl or?" and we laughed and just stared at each other and said "THAT'S IT!"

So, my advice would be to chuck a few name around and if it just feels right, do it!