Control Switch

How often should I change the contraceptive pill?
Hello, I'm on birth control Yaz and I was about one year and means. I was wondering if anyone knows how many times you're supposed to switch brands of birth control? Or should everything? I heard that the body becomes immune to change every year, year and a half, or if bleeding occurs pause … I was thinking about change, but I 'm not sure if needed? Thank you!
I never changed once since he was 13 until age 27. Never had any problems with my body being "immune" to it.
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