Depo Shot Good Or Bad Idea?

Based on your opinion or experiences, do you think the Depo shot can affect fertility? I'm 17 years old. I barely started. I hear so many things about this shot. Everyone is different. But I mainly hear bad things about this shot. Since I barely started.. I wanted to know is it a good idea to go on with my second shot? My next is in May. Or should I switch to the pills? I don't want the implant because that one is also scary. Sounds scary according to many womens experiences. Idk. I'm on time to think about what I want but I just want your help. 

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