You are not alone. I know several mums who suffer like this. Back in 2006 I suffered from Harm ocd which was terrible.

    During lockdown I got this thing about sperm on toilet seats. I spent hours disinfecting and bleaching toilet seats in case a tiny drop of pre cum containing sperm got inside any female going to the loo even hours after I had used it. Ocd is an evil disease but it can be brought under control. But I know from experience, it’s not easy. At present I’m OK. Fingers crossed.