Ive been on yaz 3mg for 4 months now but for the past three days ive been bleeding in the middle of the pills. i am a power lifter and i take creatine and bcaas (if that makes a difference). i am also on accutane, 30mg twice daily. why is this?

This sort of breakthrough bleeding is relatively common, especially since you have been on the pill for only a few months, and may very well resolve with your next cycle. Often there is no obvious explanation, but common triggers are taking the pills irregularly, antibiotics, illness, and stress. Your reported supplements and medications are not a factor.