What would happen if i stopped taking the pill

My dad told me recently that i should stop taking birth control cause he noticed my body changed alot . He said it made me get fatter and i totally agree. Last year i wasn't on it and i was skinny af well no duh i had a eating disorder * i still do * but like i'm not fat or skinny but if i get bigger then yes i would be fat. Like my thighs had a thigh gap and no its gone well eh. And my stomach is bigger now in my opionion , but like what would happen if i stop taking birth control , i blame it for making me like this  BTW i'm 16