Which week am i in?

[Alexia26]

Hi, this is my first pregnancy and I'm a little bit confused as to how I should count it.
I'm in my 22nd week dated from the first day of last period,so if I know that I conceived around two weeks later should I consider myself 20 weeks pregnant? I was just reading about the development of my baby at 22 weeks and then the thought occurred to me maybe all this time I have been reading two weeks ahead should I now look at 20 weeks?
Excuse me if this seems like a ridiculous question!! :)

Nope, it's dated from your last period so you're 22 weeks!

You're 22 weeks, even though you've actually only been pregnant for 20, it's just the way it's counted!

Ok Thanks so much! :)