Hi, I have been taking microgynon 30 for approx 7 years, and always had a withdrawel bleed in my 7 day break. Last month I missed my period (I was very ill the first day of my break) I continued to take my tablets, I am now into my 4th day of my next 7 day break and still nothing. I have literally taken 7 clear blue tests and all say negative. What could be the other causes of this? Thankyou in advance