16 & not on birth control

As you can tell from the title I'm 16, I've been exposed to intimate contact lately and I feel like being older I 
Want to get out on birth control for my safety. I also heard their good for periods? I want to ask my mom about it but I feel weird, and she might assume I'm having sex again. Short story, I had sex a little bit ago and decided to tell her about it because I felt it was the best thing too being young, I was also scared. How could I talk to her about it?

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