Ok so this is my situation. I was taking Nordet or Norden im not sure what they are called for about a year a half. I recently switched to Microgynon.Im really worried though, i know im suppose to use another back up method but i dont know for how long. Today i had intercourse with no proteccion but it was only for like 10 seconds or even less. Im on my 11th pill of my new microgynon, and im wondering if those 10 seconds can mean pregnancy. Or for how long do i have to use a back up method, like i said i've been using a back up method correctly until today my 11th day. Should i be worried.?