I'm short and thin, and very active (walk a lot, do a lot of stairs, etc). I started lifting but I had no results untill I actually increased my caloric intake.

Now I'm finaly getting results (gained almost 15lbs in the last few months and got more muscles), but I also got fatter.

I'm not fat in general, but it's all basically around my gut. If I stsnd straight (without keeping my stomach in), you can't really see it. However, as soon as I relax my posture a bit, you can see the "ugly ball".

I'm definitely getting bigger and jacked, so my caloric intake (almost 3k a day) is working. However, is getting fatter normal? Given I have a thin build, should I stop once the "fat" gets noticeable?