I realize your post is from awhile ago but I experienced the exact same thing. My hair went curly when I hit puberty. By the time I was in my mid-teens I had super curly hair. I went on Yasmin for 2 years and I noticed my hair began getting less and less curly, to the point it was just wavy. I recenly switch to Ortho Tricyclen lo (just like you!). I've only been on it for just over a month but I'm slowly starting to notice a difference...but it might just be wishful thinking too. What did you find? Did they come back? I understand your loss!