Congrats to your whole family!  I have no wisdom to impart, other than it can be done.  Neighbor couple had 5 boys, still trying for the girl.  Got identical twin boys.  Worked with a wonderful guy (may he rest in peace) who had 3 daughters, still trying for the boy.  Got identical twin girls.   See what fun you could be having??  :~)  My husband is a twin.......his mother's 2nd pregnancy of 7 births.   At one point she had 4 kids under the age of 3.  When we were young marrieds and our boys were trying my patience, I'd just think of her.  :~)  Congrats!!!