My Invisalign aligners keep falling off.

I have worn my invisalign braces for around 4 months now. The total treatment time will be around 8.5 months initially.

I had a total of 6 attachments put on, and after a week or so, 1 of them came off. My dentist told me that the attachment would not be replaced as it may come off again.

Recently 2 more of the attachments came off, however they did not just fall off, I think I was a bit too forceful when putting the aligners back into my mouth once, and I accidentally knocked 2 of the attachments off.

I have an appointment on friday to see my dentist. Should he be replacing these 2 that fell off recently?

I am just concerned that with them off, my teeth will not be moving as well as they could with the attachments, and that when the 8.5 months is complete, it will mean that I then have to wear the refinement braces for longer than if the attachments are on during the initial 8.5 months.