"i just started my second pack of sprintec. i have had very irregular periods, the longest space between was eight months. after looking up what might cause this and ruling out pregnancy i found something called pcos. i went to see a docter to get tested. after the results came back she put me on this. i got my period right on time with the pack. normal length but a little heavier. i haven&#039;t experienced any side effects except maybe higher sex drive."