Should I change to my new tray that has attachment slots even though I don't have the attachments on yet?

Basically, I've been wearing my third set of aligners for three weeks now. I was supposed to change them last week, but realized that the fourth set had attachment grooves in them for attachments I do not have yet. My appointment to get them on is in about two weeks. So, should I change to the set of aligners that have attachment slots or wait it out for another few weeks until I get my attachments in?