Bleeding while on the Pill?

Hey so I have been taking pill for a while and never had any issues but recently I decided to double back and take two months worth without the 7 day break inbetween (usually this is fine to do) im a week into the next pack and experiencing a period even tho I am still taking the pill? Is this normal and how long will it last for ? also once I finish this pack and have my 7 days break will I have another period?