Mixed my trays up. Is this OK?

Sounds like you should be on week 4 instead of week 5. Have you already worn the 5th aligners for one week?  If you have, I’d suggest you wear the 5th aligner for another week (2 weeks total), then move on to the 6th aligners. this way, your teeth movement will stabilized. If any doubt, call and see your dentist to see what he recommends.

HI there, I would love to answer your question, however there is a lack of information.  You are in Invisalign?  And you need more trays?  If you have used up what you have, then get the next set/series of aligners from your dental office.  If this answer does not make sense to you, then please supply more information.  Thanks!