I went to pet goods on 11-3-12 and saw young feeder rats. It broke my heart to think of the little half bald half fuzzy babies being eatten so I bought one. Since I bought her, her belly has started to bulg. I don't know if she's been around males before I bought her and she's been acting really odd the last two days and her belly is ferm. How will I know if my little girl is going to be a mommy?