first off my sister informed me that trinessa is not good at all. you shoudl read into it for your safety. they say many women have gotten pregnant on this pill, have gotten yeast infections, break out, get dry skin and more. i dont mean to freak you out but i just wanted to inform you. regarding what to do with taking the wrong pill i have no idea i ahve never heard of that happening. it is so an honest mistake which made me chuckle when i heard it :-) not in a mean way! call you doc office if you cant get an answer. just be protected during this time of confusion.