Unexplained weightiness gain?? :( I'm confused.?

I'm a 14 year old girl, and I have my growth spurt when I was 12, I also started my interval when I was 12. I am still stuck contained by a 32 AA bra like I own been for several years. I am 5'8. I don't know why, but I enjoy gained 4 lbs. What is wierd is that my jeans should be fitting tighter but I if truth be told think they are a bit looser than before. And when I look surrounded by the mirror at my stomach, I am certain I enjoy not gained podgy.
So what could this weight be? You are not done growing - you enjoy more than one growth spurt :) You probably got rather taller.