I feel bad. I was cleaning cages and put the male in with the females while I cleaned his tank. I was waiting for his tank to dry and forgot about him being in with them. I took him back out but I weighed one of the females today. She is 26g and is looking quite plump. I can't tell on the other girl but she's 24g. When they came to me they were around 18 or 19g I think. But I know a pregnant mouse when I see one. Will this harm her, being so young? I believe she is around 9-10 weeks old now.