The pharmacist told me there was no difference between the two and everything should continue the same, but now i'm not having my period? I've had cramps and been very hungry but nothing else for the past two days. Is this normal?

Also, On lessina I was having my period the week BEFORE my placibo pills, so i'm used to having my period then. Now it's the week before placibo pills and i'm not having my period. Should i be concerned or should i wait and see?