I am 17 years old and before I started taking Yaz my periods wer...

I am 17 years old and before I started taking Yaz my periods were heavy and my cramps were so painful I could barely move, but it only lasted 3-4 days. I am on my second pack of Yaz and my period was a week late, when it did finally start I was glad that it was light, and my cramps are not as painful, but it has lasted 12 days and is still going. ( I am going to ask my doctor about that at my next appointment.) I don't know about loss of sex drive cause I am still a virgin and am only taking Yaz for fewer and lighter periods. I haven't smelled anything odd yet and I hope I never do. But I did get headaches when on my period and I was hoping Yaz would help that too, but it hasn't worked so far. Reading what other people have wrote has scared me a little cause right now my only problem is the length of my period. I hope I don't get anymore bad symptoms. Is there another kind of BCP I can take that doesn't cause so many problems? Cause I don't want to wait for these problems to happen to me, I want to prevent them!