I'm 22 and Ive never been on BC before, my gyno started me on Femcon to regulate my cycle however after taking the Femcon for one day I was so sick I missed two days of work! I switched to Yaz and so far so good, Ive only been on it for a week but I haven't noticed any side effects so far. I just think the pills work different for each person. Hopefully I don't have any bad side effects later..