May I just add my 2 cents?
I believe that your body is SUPPOSED to bleed every month. It's normal; it's natural. To stop it from doing so (unless you're pregnant of course!) is NOT normal and NOT natural, therefore NOT GOOD FOR YOU.
Having said that... I was on Yaz for 2 1/2 years. I thought it was the best medication in the whole wide world! I had a period every 3 months, and when I did there was NO cramping, NO pain, NO acne, very little bleeding at all - I just thought it was a medicine from the goddesses!
Yeah, great med. I ended up with a P.E. - that's pulmonary embolism, or the layman's term BLOOD CLOTS IN MY LUNGS. A potentially life threatening condition. I was lucky; I'm still alive.
My friend, who is a nurse, was not so lucky. Her "blood clot" was in her stomach, and while she is still alive, she did almost die- ended up over a month in the hospital & had to have a complete hysterectomy. She was only 26 years old.
I'm an advocate of "do what's best for you" - but please, for your own well being, reconsider anything that stops what nature has intended.