Why am I gaining weight?

I'm 13, and 107- 109 pounds. I'm not calling myself fat, but for some reason, I've gained two pounds in the past two days! I've been eating really healthy, and I've been getting a good amount of exercise, so I dont know what happened.

I need to know why I gained two pounds, and how I can burn it off, back to 107 pounds, and keep it that way.

uhhh dude you probably got taller, your gunna weigh more the taller you are if not it's probably water weight.

not to be intruding but I know a lot of my friends are having sex and then dont know why they gain weight put then they found out they were pregnet but if you have not have had sex maybe you have been eating something different and it didnt go will or maybe you have not being exercising enough

Its part of growing up, puberty. Gaining weight is a sign of it. Some girls get it, others dont. You just happen to be the unlucky one. For instinse my best friend was skinny for her entire life and when she hit puberty she gained a lot of wait, you could consider her 'big boned' now.

But my Doctor says Im not sapposed to be growing that much anymore. Im not going to get any taller.

Also, IM THIRTEEN! Why would I have s*x, HUH?
Sorry, spazzed out about that part.

Anyway, I also go to the bathroom before I check my weight. It's not all water weight.

your doc is wrong! A 13 yr old girl not growing! usally a girl stops growing around 2 years after her first period, but depending on your own body it could be different. Im 21 and iI grew an inch in the last year. Also you can gain when you stressed. Two pound is not a huge deal. Most likely you just lose it then gain it back. It almost impossible to stay the same exact weight.