Exactly!
And Purple, if you keep the male in 24/7, you can usually expect a litter from each female every 3 weeks. On occasion, they won't get pregnant right after giving birth and will breed after their litter is weaned and you have to wait an additional 3 weeks for that female. A mouse can have many many babies, but if you go by 10 babies per female, then every 3 weeks, you should get 30-ish babies.