No, the bumped the Beta Key deadline up to the 20th (that sunday night)... So if you put it in before then you're fine. Just go to
www.swtor.com/tester (believe that's the link) and accept the Beta blah blah blah and download the launcher. Then launch that and log in to download the beta. Also if you've already done this you can click on the View Info button (believe it's labled as such) and it'll tell you if you are in the beta.
One last thing, it seems some people aren't getting their emails saying when they're getting into the weekend beta. But they're still getting into it. Since we know the servers go live and batch one gets in at 10am CST on friday try to log in then. If you can't get in then try again on Saturday at 10am CST, that's when everyone else will be getting in. You could still get an email tonight with your time/date or tommorow. I have a friend who didn't get his till today but others I know got it yesterday.