My little lady Faye is breathing really fast, she's not panting or gasping for breath no red mucus or anything. I know she may be pregnant (sneaky girl) She just recently built a big nest in her cage and has only been breathing like this since then. Could this be possible pregnancy or something worse? I just got her about 2 weeks ago and I love her to death, she's only 3 months old and I really don't want to lose her. Any ideas? She's my first female rat.