I have the same type of OCD, and have come up with hundreds of scenarios that “might have” happened. they feel so real, and I don’t have a good way to combat the thoughts or prove that they didn’t happen which gets me to the point of feeling like i need to confess to my boyfriend and have done it many times, and the relief it brings is only temporary. here’s an article i read about false memory OCD that really helped me to realize that maybe i’m just making this all up. https://www.sheppardpratt.org/news-views/story/did-we-already-discuss-false-memories-and-ocd/
if you need anyone to talk to i’m happy to help