Does anyone else ruminate over purchases and other decisions related to concerts??

I just went to the concert of my favorite kpop band from my middle/high school years as a birthday celebration. I had an amazing time but I keep ruminating about random things related to the concert. For one, I regret being such a law-abiding person and not moving from the seat I paid for to an empty seat with a better view (which is fairly typical to do at kpop concerts). I had a good view from my seat but I keep thinking - what if I had just moved? Then, after the concert, I was sort of in a daze and wanted to go home and forgot to stop by the merch table. There was a specific merch item I really wanted but had decided not to buy because it was overpriced, but now I regret not buying it so much and I'm ruminating over that too. I'm not sure how to approach this situation because the thoughts feel exactly how my ocd does, but these are both things I genuinely regret not doing. Does anyone else experience this? How have you worked on it??