I recently got my first two rats, Dove and Jenny from a really good breeder near me. They're both girls, around a year old and have been doing pretty well since I brought them home. However a few days ago when I was handeling Dove I noticed her belly looked a little big, I thought maybe she was just fat but now her belly seems to be bigger. And her nipples seem more prominent than her sister's. I've only had them for a week and a half and they haven't been around males so she couldn't have gotten pregnant with me. And the rattery I got them from was very responsible and definitely didn't keep non breeding females with males. I emailed the breeder but haven't heard back yet. Based on this photo does she certainly look pregnant or could she just be fat? And if she is pregnent how long do I have and what should I do to prepare?