Ok Im really really really confused can someone help?

Alright. So. I'm 12wks1d pregnant. But I went online and got a ticker for my myspace. (one of those little countdown till baby comes sort of doo dads.) And it says "Congrats you are in your 11th week!" but It still says baby is 12wksand1d. How does that work? And will I be in my 2nd trimester when BABY is 13 weeks? Or when I am?