Does this set back/ reverse PIED recovery?

I am thankfully at an almost 180 day streak to heal PIED, and I have been avoiding all porn like the boogieman. However this morning I accidentally saw a porn PFP on youtube and though I did not get aroused (which would have worried me had I not known that other porn addict recoverers noticed they don't get aroused to porn anymore) I still am worried that it set me back merely by looking at it and feeling a sense of shock and fear. Will that set me back in healing? Or is it sign that I actually am unwiring from porn? (after all that same morning I got a chub to the mere mention of sex in a book I was reading, that has not happened since middle school for me.) It's a shame too because this happened when I started to notice I was coming out of a 1 month flatline, I just don't want this to effect me at all...