Flip flip flipping hell! I think I've done it this time.

I facebook stalk my psychologist. Today I found a group she's in (it's an open group) and it says 'seen by' on all the posts. Will it say seen by me, even though I'm not part of the group? God, I'm panicking. How will I explain myself out of this one? Please tell me it only says 'seen by' if you're part of the group? Help!!