Is my weight and height ok for my age?

Is it ok for a 15 year old girl to weigh 60kg? (Im 172cm tall) Sometimes i feel skinny but others i feel fat. When i bend over i can see my ribs, backbone, sholderblades and my hips so this makes me feel skinny but other time i feel fat. I use to have an eating disorder but i got over it and gained about 10kg and now i usually feel good about my weight i just dont want to get any bigger then i am now, so what do you think about my weight? am i ok? I also just started the birth control pill and was wondering if anyone has gained lots of weight from that? Please dont be rude in your answers, im being serious. Thanks