contraception pill!? do you get your period right on the yellow tablets?

Hi ladies ! I have a question to ask ! I'm currently on the contraception pill zoely which is very new on the market! I started taking it the day I got my period! (Took the yellow tablets as that's what the pharmacist told me to) since then, I was taking the normal tablets till I reached yellow! 
Now my question is, I haven't gotten my period yet but I just took the second yellow tablet ! Does it take a while for the period to come once you hit the last 4 tablets which indicate you should get your period ? Or how does it work I'm not too sure! I haven't been on a contraception pill in ages so I don't remember !! If anyone could let me know that would be amazing :))!