An event from my past, irrational worries

[Obse]

Hi,

I’m a volunteer at an animal shelter and a big animal lover. About 3 weeks ago, a staff member at the shelter found a frog in there, and she invited me to come with her as she went outside to release the frog. She put the frog near a puddle and went back inside the shelter, but since I have OCD, I felt like I had to stay there a few more moments to make sure the frog was okay. After staring at the frog for a few moments, I started walking back to the shelter, but I kept looking back at the puddle, just to be absolutely sure.

At some point when I looked back the frog wasn’t there anymore. I went back to puddle to take a closer look, but the frog was nowhere to be seen, so I just went back to the shelter.

Even though I can tell with almost 100% certainty that the frog simply jumped into the puddle when I didn’t look, I still can’t get over the idea that I accidentally stepped on the frog when I went back to puddle to take a closer look. This idea makes no sense because the closest I got to where we put the frog was a few meters away from that spot, and also, if a frog had been crashed under my foot, I would have surely noticed.

Unfortunately, I cannot reason with my OCD, and even though I keep telling myself how irrational my worries are, they just don’t go away.

Any advice on how to deal with this trouble?