Lost Retainer! Clearsmile Aligner

[Mrs M]

Hi, has anyone had their teeth straightened using the clearsmile aligner and then lost their retainer? My teeth have moved significantly in the last few weeks because of this. I've kept all of my aligners (12 in total) and having gone through them last night, I'm wearing no 9. So my questions are, has anybody done this and their teeth have fully corrected? Do I need to wear each aligner for 2 weeks again? I checked with a friend that works in a dentist and she said I was doing the right thing but hoping others on here have done this too and can confirm I'm not going to wreck my teeth!