Is my robo pregnant?

[Hbg1027]

Hi, I got my robo 2 weeks ago, I thought she was pregnant, I took her to the vet, she has a little bump on her back, nipples barely showing, but stomach is a little enlarged and has not gone into heat at all. My vet said he’s not sure but possible, the pictures below include an x ray which he said he could see something a little, a picture of her burrowed and a picture of her from under which shows her chewed up food all over the ground (she has been hoarding food and nesting). Thanks!

https://ibb.co/XxB3xMz
https://ibb.co/h8NT7tr
https://ibb.co/28t3DZ1
https://ibb.co/JQ1jnYj
https://ibb.co/SR0WHNK
https://ibb.co/R4NwhqS
https://ibb.co/f0Wx2Yq
https://ibb.co/R00QdjP
Here are some pictures, I got her from petco where she was in a mixed cage. But they were all females, then again, petco has been known to be wrong.