I've been keeping a 1.3 mouse group together for about 3 weeks now and I noticed 1-2 of the females are already showing signs of being pregnant. You know that swollen, I just swallowed a golf ball look!

My question is, should I separate the prego female from the group or should I remove the male from the group?

They are in a 10gln tank, screen lid, water bottle, they are fed Kaytee Diet and Mazuri pellets and are kept on 2" of Aspen.