Fat Sheep = Pregnant Sheep?

Flower is getting HUGE! I though she was just packing on the pounds because its winter and her coat was thicker, but now I'm not so sure. I have been looking at photos of pregnant sheep and her belly looks similar. I need to keep a close eye on her, because if she is preggo she should be due sometime in March. The last time Dunkin was together with the females was in October, and at the time he was only 5mth old! I can't wait to see what happens!