I have been taking Femme ED 20/100 for about 12 months. I have taken the 21 pills continuously to purposely miss my periods. it has been about 4 months since my last period. 8 days ago I started the sugar pills as the doctor told me to have at least 2 periods in 12 month spans. the thing is my period hasn't started yet and this is really unusual. should I be worried?