I am supposed to get my period in 12 days. on bc pills for 11 months. never spotted until yesterday and today. i wipe and it's brown. why?

Missed a pill: If you missed a pill , have infection,growth , close to menses , recent sexual activity with am one dryness, abrasion.Any numdber of reasons.More history would be helpful.Observe!it doesn't dound serious

Not necessarily abnl: Spotting between periods is not unusual, and many women have this happen once in a while. It is usually not reason to be too concerned. Potential causes include: missing a BC pill, sexually transmitted disease (STD), vaginal infection or irritation. If you had unprotected sex (without a condom) you should be evaluated for STD; if vaginal discharge or itching, get checked for vaginal infection.