I am 25 and have been taking the yaz pill for a good 12 months. Normally on the pill you're periods are supposed to be regular, but mine are not. I have von Willebrandes but that has never been a major issue before with taking the pill. I have three kids and have been on and off them in between pregnancies. I take them everyday and i don't take any meds that would interfere with the pill. I'm unsure on why my periods come and go as they please. any ideas? i'm beginning to think there's something seriously wrong. I don't have insurance so any help with this issue would be appreciated.