Copper IUD

I need advice: I'm 16, and my mother had a very strong opinion on hormonal birth control. I really want to start some kind of birth control to help my menstrual cramps that leave me hunched over most the day on the first two days of my cycle. I've tried bringing it up to her before, but she immediately assumed I wanted to have sex with my boyfriend, who is also 16, which we've both agreed to wait on until we are safer and more mature. How could I bring it up to her in a way that I may be able to just get an appointment to a doctor/OBGYN? How is the ParaGuard copper IUD? Anything would be appreciated!