If they get pregnant immediately, you'll have babies in 3 weeks. If they don't get pregnant immediately... who knows. Female rats tend to go into heat approximately once a week (about every 4-5 days), but there are factors that can affect their heat cycles as well as their receptiveness to the male, and likelihood of conceiving even if they are mated. Stress is one such factor. Count on at least a week after a move for the rats to settle in.
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