Ive been on YAZ for about 6 months b/c someone had recommended it to me. I have previously been on ortho tri-cyclen for four years and no problems. Im usually able pin-point the day of my period precisely b/c im used to a regular period, but for some reason Ive had irregularities with YAZ! my last period was 3 months late, and now im two months late. Ive already taken 6 pregnancy tests (all negative) WHEEW! I saw my doctor today and she says its all "normal" and its due to "stress" but whatever, im switching back to ortho tri-cyclen. o yeah, it may just be me but the YAZ supresses my sex drive, anyone else feel the same?