I have two females due this week, another one due in two weeks... plus... my Wilma is currently at Sherry's house (yorkiegirl2).... doing the "deed" with her Fred.
I have separate pens for the moms (and pups)... plus... Sherry is going to help me out ....... WHAT A PAL!! (Thanks Sherry!!).
I had two females give birth in January three days apart.... after they were weaned from the moms... the pups were merged together to play/sleep. It all works out!!!
Best of luck with your new additions.