How much does a small peek set back progress?

So I’m 21 days into nofap for the first time and caught myself looking at some bikini models on insta a few days ago, nothing truly pornographic but clearly sexual enough to give gratification. I’ve since deleted Instagram, but I’m really struggling and worrying about if I’ve ruined my progress by doing that, I’m not really sure what to think, so some outside input would be appreciated

I don’t think this will be much of an issue from here on out, as I’ve hit a major flatline, which I can only take as a good sign. Either way im going to continue, but thanks in advance for any responses