This is a bit of an odd question but here goes.
I have been really consitpaded, and havent gotten my period this month.
But I have been moving(houses) playing tennis,and just finished a busy week at school.
I've been feeling tried and fat but havent gained any weight.
I've never had sex.
&& I'm 13.

Does any one know if I'm...okay?
or whats going on?