As far as I can tell, your pill is a combined pill, which means that yes, there is a 7 day rule. I can't find anything to contradict that, and I don't see a reason it would be contradicted, because it is a combined pill. If you wanted to be really safe to make sure you've gotten back into the habit of taking it, you could use backup while having sex for a month instead of 7 days. But after those 7 days (or a month if you're really worried) you will be protected as protected as if you'd started it on the first day of your period.