I'm 17 and have been on Yasmin for over a year now to treat PCOS as well as prevent pregnancy. I'm just now experiencing a lot of dark spotting with some odor the week before my period even thought I've taken the pill on time every day. The longest this spotting has lasted was almost a whole month back in January, but I've been okay since, until now. Why is this happening, and will switching pills or going off of them interfere with my PCOS treatment?

Call your doctor's office and notify them of what's going on. Maybe they will switch your pills. Keep us posted!