All advice welcome!

Hey ladies!! I am 17 and will have been dating my boyfriend for 8 months now. We are serious, monogamous, responsible and have been only using condoms while he still pulls out well in advance. I check each one and I am very careful, however I know the smartest thing to do is go on a form birth control and double up protection. I don’t know how to approach my mom about it, and was wondering what people find the best method of birth control for the smallest amount of side affects. I really do not want to gain weight or acne and would like to know what some people find are the best methods & approaching a parent about starting it! Thank you !!