Scared I've accidentally seen illegal things and didn't realise (England)

I have OCD and one of my main fears is that someone posted something illegal like drawings of characters that are underage and I didn't realise that and thought they were adults, I would never knowingly do anything like that but people I followed on twitter I found out did that grim sh*t and I reported them and have reported a lot of awful people posting these disgusting drawings and I'm scared I've seen these and assumed the characters were adults and did something awful unknowingly, since my OCD got so much worse I've started just assuming the worst and reporting anything I see just to be safe and I feel like I have to "fix" the internet and report all these people (Not seeking it out of course, I look at people's following and make sure they don't follow anyone I've reported and blocked or anyone with dogwhistles I've noticed in their names or anything). But I'm scared to tell my therapist about this fear because I'm scared I'll get in trouble for something that I would never knowingly do of course. (Sorry if I'm reiterating so much, I just don't want to be misunderstood)