Is my mouse pregnant? Why is she building a nest outside the box?

Question

i got my mice 1 month ago and i asked for 2 females but they gave me 1 male and 1 female this is a problem b/c cocoa is getting huge around the mid and lower stomach so i checked and realized ghost is a male.. so now i separated the two and put her in a seperate cage with a nesting box and newspaper and cocoa decides not to build her nest in the box but on the other side of the cage is this normal? I'm not sure if she's pregnant but 3 days ago she was 36 g and now shes 43 g I'll attach photos. Pet's info: Small Animal | Unknown - Small Animal | Female | unspayed

Angel Alvarado, LVT · Accepted Answer

Cocoa does look pregnant. Gestation is about 3 weeks. She built her nest where she feels most comfortable and secure. This is no cause for concern. Try not to disturb it and when the pups (baby mice) come, do not disturb the nest for the first two weeks. You'll need to keep Ghost separate, because Cocoa can mate again within days of delivery. The pups will wean around 3-4 weeks and should be separated into male and female groups shortly after. They can breed as early as 6 weeks of age.

Is my mouse pregnant? Why is she building a nest outside the box?

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