Hi gmf214,
First off please don't panick, we all get nervous when things like this happen and your bound to hit a few bumps in the road during treatment but don' tworry - you'll be fine.
Now I am not an Ortho so I have to say your best bet is to probably check with your ortho. Now that being said, I'll give you my opinion of what I'd do - but first a couple quick questions for you regarding this tear:
1- Is it affecting how the aligner fits over your teeth, too loose too tight?
2- Is it sharp where it may cut you or cause a sore?
3- Do you have your next set of aligners?
If its fitting just as it was before you noticed the tear, its not hurting you and if you have the next aligner already then I would continue to wear it and if it got worse at any point I would switch to the next aligner, even though you may be a few days shy of when you actually supposed to switch.
I wear my aligners for 2-3 weeks depending on what the ortho says and how they are fitting me and I have popped in a new tray a few days early on a couple diffrent occasions without any issues so my guess would be that you'd be fine.
If they don't fit well and are causing you any pain (i.e. cuts or sore OUCH!) I wouldn't put in back in, I'd just switch to the next one.
Again this is what I'd probably due but everyones mouths and treatments are diffrent so why dont you give your ortho a call, even if its just for peace of mind
