"yaz is the worst birth control i have ever been on!! other birth controls would stop my period for like a month but then everything would straighten out and my period would be perfectly regular. i&#039;ve been on yaz for 4 or 5 months now, taking it at the same time every day and i never know when i&#039;m gonna have my period or how long it&#039;s gonna be. i&#039;ve been having a period every other week! that is not right!!! also one period lasted 15 days. this is unacceptable. i am done taking yaz. will not recommend to anyone, ever."