Vampire Diaries question!!?

So I download the first season and watched it as well as the episodes that have aired so far of the second season and would like to watch the weekly episodes on t.v. Someone told me it goes on every Thursday at 8:00pm on The CW but last night when I put it on it was an episode I had already seen. Does anyone know if I have the right time/day for the show and why it was a repeat? Is the season already over maybe? so confused :/