No you didn't relapse, no do not reset your counter.
We are addicted to watching porn and masturbating to porn, if we indulge in watching porn then that is what a relapse is. Your counter you have is for PMO, you didn't PMO so don't reset
Since you had no problem with ED you've already made tremendous progress at 27 days. Rewiring is what you NEED. Rewiring means spending time with real women both sexual and not. Because you had no ED I would recommend you take this chance to rewire as much as possible... However, if you find that your erections start becoming worse then you are either flat linning or Oing too much in which case all you have to do is O less and gauge progress from there..