Welcome! There is a section under Gender Methods about Ericsson if you have not seen it yet.
Yes, there are quite a few moms around here who have 4 boys and more!! Deb186 here is expecting baby boy #6 and is planning to use MicroSort and/or PGD for a baby girl next.
Best of luck on your journey to a baby girl! Do you have 3 boys plus twin boys??