If One Of My Invisalign Trays Has A Small Crack, But Still Is One Piece And Fits Ok, Do I Need To Replace?

This happened to my last tray towards the end and it was fine, but I just started this one on Sunday and I feel a small crack. Its in between two teeth and not all the way through, as the tray is still in one piece and seems to be working fine. Since I replace trays every two weeks, do I need to do anything since its not major and doesn’t seem to be affecting anything?
Also, I had lingual attachments added yesterday and two came off. I’ll probably get them replaced next week, but how much would it affect me if I didn’t get them replaced till my appointment next month? They were on my pre-molars I think on one side?? All other attachments are fine, my teeth are very sore so I know its working. Any orthodontists with an opinion?

Why Did My Invisalign Crack?

I’m using Invisalign teen, and both of my aligners are starting to crack near the gum line, between two teeth. They are both cracking in the same spot, but on opposite sides of my mouth. The orthodontist suggested that I may be clenching my teeth when I sleep, which may be the case, but I have no way of knowing this for sure. What could have caused it to crack? Any suggestions would also be appreciated.