birth control slowing down weight loss?/ Tall girl

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Hi, I'm currently on depo provera and im finding it hard to lose any more weight :( i'm 17 standing tall at 5'11 and 189lbs at the moment, would LOVE to be 150. My goal is 175 by the end of febuary! Is anyone else on depo provera? any tips or advice would be great! Thanks so much guys :)