Nope, not finding out. I did find out with my first, but that was more a confirmation of what I already "knew." I wanted to have a little time to adjust if it turned out I was wrong ... I wasn't.
The younger three have all been surprises. I didn't have any strong feelings about any of their gender, which was odd after having been so sure about #1. This one will be a surprise, too ... I prefer it that way.