What I have observed with mice in general, is that when the female is not in heat, the males leave her alone. Right now all three males are in one corner chilling, while she is nursing. But I have also seen them laying with the pile of babies. I do think that the females should outnumber the males. If I had started this intentionally, I probably would have had 2 males and 3 females. But this is how it ended up so I took it a step further. She is doing a good job so far!