Hi I Have Been Taking Femilon For Contraceptive Requirements As

Hi

I have been taking Femilon for contraceptive requirements as well as because i have PCOD. I am also a thyroid patient. This month i have been waiting for more than 7 days now since the medication is complete, however have still not got my periods. Please suggest if this is normal or if there is any thing else we can do . I also took a pregnancy test which has come negative.