What Are The Consequence Of Irregular Use Of Monofeme?

Hi there, I have been using monofeme birth control for over 2 years now and have always had a regular period with a 28 day cycle. I am actually 15 days late today (was due on the 6th) and i have experienced abdomenal cramping as though im getting my period but nothing. I also came very close to throwing up a couple of times with slight dizziness. also that month i missed max 5 pills for the month. can you help?