No, you aren't supposed to be released for a 24 in 7 just because you've worked or been on call the last 7 days. They can deadhead you somewhere today, tomorrow or whenever, it's flight duty that they can't use you for. Also, make sure you didn't have a 24 hr break on a trip in the last 7 days, that counts. They will notify you (or you have to acknowledge it if you check iCrew) when you're assigned a 24/7 break.

What they often do is give you notice of a trip say, tomorrow night, and at the same time give you the 24 hrs off before that trip. That gives you your 24 hrs of time off.