What Are The Risks Associated With Microgynon 30?

I'm 20 years old & been on Microgynon 30 for nearly 2 years now... I've been told the risks, I'm just concerned of how high or low the risk of blood clots or stroke/heart attack actually are? I'm a healthly weight & a non-smoker.

Also is there an increased risk if you take the pill continuosly without a break?