Losing weight?

I'm 17, 5'3, a large frame and now 153 pounds. I used to be 130, put i quit all the sports i was participating in. i did get down to 149 and haven't been eating crap at all. when i'm not at school i've been keeping active by cleaning constantly, jogging every morning, walking every evening, and i have yoga cl twice a week. i've made sure to eat a healthy breakfast every morning, i eat granola bars, yogurt, and cereal bars all filled with fiber for snacks through the day, i have fruit and a sandwich for lunch, and then whatever my mom make for dinner because i have to, but it's usually healthy anyway (she's a health freak). i cut out icecream and chips and stuff like that. the only bad thing i'll eat is some popcorn once a week on movie night, but it's one bag split between like 6 people and i ate some chocolate today, but other than that i've made sure to eat what my doctor suggested and drink at least 64oz of H20 along with all the activity, but i've gained 3 pounds.why and cont...