Delayed Start of Invisalign Treatment, Teeth Have Moved Slightly from Where They First Were when Impression Was Made?

I delayed the start of invisalign treatment, my teeth have crowded slightly since the impression was made and the whole left side of my upper teeth seem to have moved (in a straight line) closer to the centre of my mouth... My aligners (the first tray) still fit except they don't fit perfectly on the left side, I have to bend the aligners slightly, although when on they seem to fit right. Does this make sense? Will the treatment still work? Thank you