Stopped the pill and still no period..

I stopped taking combination pills on January 16th. It has been a month and a week and still no period.. Prior to birth control (in total I’ve probably been on the pill 8 or so years) my periods were not regular. While on birth control I didn’t get a period. If I forgot to take a few pills while still on birth control, I would get my period almost immediately - or what seemed to be. I’m shocked that I still don’t have my period. I’ve taken pregnancy tests and all are negative. How long should I wait to get it before I am worried..?