So, I have never had baby rats before, and my bf and i rescued a couple from a very bad owner, they are still babies, but I know for a fact that they are of breeding age. we have had them both for about three weeks, and I had no idea if they were boys or girls, or what. yesterday I did some research online and checked out my two ratties, to find out one is a female, the other a male! I didn't think too much of it, until I read how easily they can get pregnant, and mine have been living in the same cage for three weeks! I feel really bad since they are also siblings, and I had no idea. Based on what i have read, and the fact that the female is a bit plump, I bet she is surely pregnant, which worries me! I am going to buy a new cage tonight when my bf gets off of work and will put her in there for about a month, if no babies arrive we will get her spayed and put her back in with her brother. but if there are babies... well I have no clue what to do besides handle them to socialize them. i feel really guilty, even though it wasn't really my fault. I wish i would have checked them sooner to detect their genders!