why can't i maintain my weight?

About a month ago i lost around 7lbs. Now i've been trying to maintain my weight. I've been eating under 2000 calories and have been getting 2hrs of excercise (soccer) 5-6 times a week. I weighted myself, and i gained 2ish pounds. I've been getting this much excercise for 2 weeks so far. Why am i gaining weight??
(I eat really healthy too.)

[Barb135]

If you'd gained 10 pounds in 2 weeks, I'd tell you get tested for hypothyroidism, or some other medical issues; but gaining just "2ish" pounds is pretty difficult, because it's really just a fluctuation, not really a true "gain" -- my weight can fluctuate up to 5 pounds in a 24 hr period.  

Are you weighing at the same every day, after going to the  bathroom and before eating/drinking?  Maybe 2000 calories is too much for you.  Maybe the "2ish" pounds, is fluid retention, not fat?  

[Nikki013]

the number keeps going slightly going up. Maybe it is water retention, but with all the sports, i drink more fluids than i usually do. I went to a nutritionist awhile ago, and she did the BMI test which told me how much muscle, fat, water etc. i have. i need about 1500 calories if i sleep all day, 2100 calories doing normal everyday activities, and more if i do excercise (which ive been doing a lot of). i don't understand why i'm gaining..

[Barb135]

You might need to have your thyroid tested to make sure you aren't hypothyroid, which can cause weight gain.

[Nikki013]

i looked up hypothyriodism, and i don't think that's the cause. I'm only 16, and an athlete. But thank you!

[Barb135]

Just a thought -- BTW - hypothyroidism doesn't care about your age, athletic ability or how healthy you are.  I've known many very young children to have it.  Best of luck.