The pill

Hi, so I'm on the combined pill and I have just finished the pack 1 day ago, am I confused about when I am ment to have my period. Am I ment to have my period at the beginning of the 7 day break right through, in the middle of the 7 day break or does my period start at the end of the 7 day break when I start my new pack of pills? My doctor didn't explain this to me! Thank you for your help