So here's my situation, I've been on yaz since late 2009 I switched from aless because my body became immune to it so my gyno put me on yaz, I've never had a problem with this pill until the past 4 months, my period always came like clock work until January it was a bit late and lighter than normal. Then it became lighter & less days bleeding. And now this month I'm 2 weeks late. From what I've read it is common for this to happen while on yaz but I get stressed because its the only for of BC my fiancé and I use. I like having my period every month for a little reassurance. Has this happened to anyone else who's been on it as long as I have been?