no it wasnt pregnant i just kept 0ne of them(wut i do is by 2 from the petstore on payday kill and feed one when i get home and take care of the other one for a week then thats its d day)

its just what pet stores sell as "adult mice" are usually far smaller
thats probably what it was because one time they were almoust out of mice and the last ones were pretty big so i guess i just turned it into a jumbo adult mouse!