I've took contraceptive pill rigevidon for a week I started taking the 2nd day of my period my period won't stop Been on for 11 days is this normal?

Breakthrough bleedin. Breakthrough bleeding is the most common complaint with the first package of pills. It does not indicate that there is a problem. Keep taking them at the same time every day and it should be better with the 2nd pack and gone by the third. Hope this helps.