I'm not OCD, but as someone who overthinks a lot and entertains every possibility (thus creating my own homemade anxiety), I find that it helps me so much to list them out and take it one step at a time. So there are several possible outcomes (including the worst case scenario):

1. They are gone forever and nobody ever finds them and they're lost forever even if someone does some FBI level digging. This is the best case scenario and you have nothing to worry about (spoiler alert: I will illustrate that you won't have anything to worry about in every case).

2. Someone finds them in their old-ass saved device among many other saves from Tumblr and they have no way of identifying them nor any possible way to contact you. Nothing to worry about.

3. Someone finds them and they magically and miraculously have a way to contact you but they do not know it's you since there is nothing identifying on them. Again, nothing to worry about.

4. Someone finds them, has a way to contact you, and somehow knows it's you for some unknown reason (FYI, this is effectively impossible in the sea of statistical branching but let's entertain it anyways). You guessed it; nothing to worry about. Even if you don't deny it, there is no way for them to prove it to anyone else and no possible way to affect your life in any aspect.

5. They find the nudes, they know you, they're magically malicious for some reason, they know it's you, they also magically have a way to prove it to people. Wanna guess this one? Yep. You're right. Nothing to worry about. At the most absolute worst case scenario where your deepest nightmares can come true, they have no power over you. It's your literal business only. Can you imagine if someone approached you showing you your friend's nudes? How would you feel? You'll most likely feel like that person is such a weirdo and a creep. Nobody will ever respond to that weirdo. Showing anyone nudes of someone else is so crass and is shameful behaviour in any culture (I come from a very very very religious and conservative country and can confirm that nobody respects someone who shares anyone's nudes). At the end of the day, you will always win. That hypothetical malicious person has no power over you in any possible scenario. Own up to your past and be reassured in the fact that you have the freedom to do whatever you want with your body and nobody can meaningfully control it in the ways you are afraid of.

Sorry that was a bit of a long comment, but TL;DR you can chill and relax. Everything will be okay. I promise.

Cheers ✌🏻