Female rat has strange vaginal problem, possibly pregnant?

My female rat, Sophia, has a strange tube looking thing hanging from her vagina. I’m not sure what it is, and I’m also not sure if she’s pregnant. If anyone could shine some light for me as to what’s going on with her, I would be very appreciative!!! Very worried about her. I have attached pictures.

 

The picture is blurry and difficult to see what you mean
Can you get a better picture? http://ratguide.com/breeding/anatomy/female_reproductive_system.php
Why do you think she may be pregnant?
How old is she?