Used tret twice, not looking to continue- will some damage be done?

Hi all, sorry if this is a silly question, I used tret for 2 nights in a row without actually realising (skin and me, didn’t check ingredients, stupid of me). Anyway- I don’t wish to start a tret journey at this point in my life, I don’t want the purging or dryness no matter how great the results will be long term, my skin is fine as it is- all I wanted from skin and me was a little glow. Nothing dramatic.

Anyway, I’ve since done 2 nights of the treatment which contains 0.009% tret, almost instantly seen dry skin, spots and ugly looking texture… I’m planning to stop immediately.

Is 2 doses enough to cause significant damage of trigger significant “purging”? Just looking for some reassurance I’ll be fine and won’t have weeks of uncomfortable skin after only 2 uses! Feel so stupid!!!