Is the pill the best form of birth control?

I want to know why it is and why it isn't,I'm debating if I should get on it or not. I'm 17 years old and in a long term relationship,we are committed and if pregnancy happened we would deal with it and raise our child but I really don't want to ruin my chances of children in the future. 3 months ago my cycle went from 29 days to 35 days and I don't know why. I want to regulate it but I don't know if I should get on birth control from all those bad stories. ADVICE PLEASE!! 

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