I saw somewhere on a thread discussion that usually the provider will suggest you to move to your next trays. Keep them in for at least 2 weeks and adjust your schedule for the next set of trays. While others suggest that you go back to your previous tray. I’m not sure which is the best choice so best to contact your provider.
On another note, don’t wrap your aligners in a napkin because most cases of aligners being lost is throwing the napkins and forgetting that you had your aligners there. Always bring a container where you can put your aligner when you remove them for eating or brushing.