Calling all mom's..... advice?

Hello! I am new to Glow. My husband and I are in our 30's and would like to conceive our final child. We currently have two boys (11 and 5) only one of which is his. We want that dream come true of having a little girl. I have done lots of research over the past couple days on how to conceive a girl. I'd like to know if any of you have pointers, tips or advise? Thanks