I assume you had a first round bye like most of us (Week 20), I guess that would consider you had a higher rank in that round than your opponent, but not sure. I think you will progress.
To check, on the eliminator page, change the Week 21 drop down to Week 22 and see if you have an opponent. If you see a team, you made it through.
I like checking out my opposition via the rivalries option. Choose to setup a rivalry in the League menu, type the first few letters of your opponent's name in the box and rather than clicking the + next to the team, click the team name. Much easier than finding them in the rankings (usually). Not a good thing to know when you lose to someone ranked 2000+ who you would have easily beaten any other round (speaking from experience).