Over reaction or relapse ?!?! Please help

Hi guys, so I’m technically near 40 days on NoFap however I was edging for quite a while and so I’ve decided that I’m on day 19 today with no PMO or edging whatsoever. Very strict atm. Lately I’ve been having quite a few sexual dreams, waking up with erections a lot. But I have again not done any pmo.

However this morning I was scrolling through my Instagram and came across on my Instagram stories a picture of a girl flashing her boobs at a party. I stared at the photo for around 5 seconds purely because it was quite shocking as I know this girl and I will admit it was hot. But I did not pmo or stare at it for long. I felt like a feeling of slight excitement but after 5 seconds I scrolled away as I realised I shouldn’t be seeing this stuff. I did not seek out this photo. I did not touch myself to it, I didn’t go back to it. And every time it enters my mind today I’ve been immediately thinking of something else. I feel like because I had a sexual dream last night aswell as seeing that picture this morning, I feel perhaps this is some form of relapse as I shouldn’t be seeing sexual content. However I never asked or sought after this. Should I go back to day 0?? Thanks guys