Take a number symptoms and conditions

I just went onto: http://www.drugs.com/yasmin.html just to see what they had to say about Yaz, (I am no-longer on the terrible thing, see my previous post) but I saw something really scarey on the site, namely: "This medication can cause birth defects in an unborn baby", now I'm sure they are referring to falling pregnant whilst taking the medication, but my concern is that it appears to take a number of month for the drug to leave your system competely once you have stopped taking it, so when is it safe to get pregnant after coming off it??? this is a very very scarey!!!! des anyone have an answer???