Well sometimes you put a boy and girl together and you get babies...but othertimes nature gets in the way and it isn't always easy to determine why (this is the reason why I hadn't responded yet )


How old is the girl rat? Do you know how much she weighs?

Where did you get them?

What "type" is or what markings do both have?

All these questions lead to possible reasons why you haven't seen the rat get pregnant. Also, it takes about 32 days for a female rat to give birth and some don't "show" till the week before.