"i had previously been on errin for 1 year. after switching pharmacies, they gave me the generic version, jolivette. i&#039;m finishing up my first pack this week. while on errin, i had two periods a month (aggravating, i know!) but it was just like clockwork. after starting jolivette, i had my first period during my second week but did not start on my fourth week like i did with errin. called my doctor and she told me that even though they are essentially the same drug, they can affect you differently. she told me to give it a few months to work itself out. the only complaint i would have so far, is how ridiculously pregnant it makes you feel. i had very sore and tender breast for almost 2 weeks and irregular periods! time will tell!"