I got a question?

[DrunkShadow]

On Wednesday i fed my 18in/5month ballpython. Since i have gotten it (2 weeks ago) its only the second time i have fed it. Well the first time i fed it a pinkie, but those are too small. Then on Wednesday i fed it about a medium size full grown mouse. And for the past days its been in its log sleeping, or if it gets out it just stays in the corner wrap into a ball. It use to be really active almost the whole day. It wrap areound branches but now its just laying there. I fed it in its tank because it didnt want to eat outside. Is something wrong, was the mice too ig, or is that normal with all snakes?
Thanks