What is the best option for a first time birth control user?

I’m 15 going on 16 and my mother wants me to go on birth control. I’m willing but honestly I’ve heard a lot of women gaining weight and things like that, which I obviously don’t want. What’s the best option for me? She’s only giving me the options of the pill or the shot.

If you need more details about me I’m about 5’7-5’8 and 140lbs.

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