First of all ((HUGS))!
I have pure O OCD and have been exactly where you are MANY times. The worst was after my 2nd child was born and when I was pregnant with my 3rd (and this was 7 years apart!). I've also feared harming my parents (when I lived at home), my husband's family (right before we were married) and my husband.
To me, even though we don't suffer with the compulsions (except for ruminating in our minds), this is one of the worst forms OCD can take. When you fear yourself, it is hell.
At my worst, I called my psychiatrist that I had just started seeing a few weeks before and told her I was afraid I really did want to harm my baby. She, very calmly said, "No you won't." I said "But what if I do?" She said, "If I thought you were any risk to your baby at all, do you think I would be just trying to calm you down over the phone right now and not calling the police and/or trying to get you to go to the ER?" It hit me...she could see what I couldn't. This thing that I feared, I would never, ever do. She told me "People with OCD are typically the safest people on the planet. Because even the tiniest thought of doing something terrible produces awful panic and anxiety. They are the least likely to ever act on it." And you know, she was right.
I know in your current state your OCD is throwing the "But what if" stuff at you. Making you think that maybe you really might do it. But you won't. I promise. You won't.
By the way, my 2nd child is 10 years old now. I have 3 kids and my OCD doesn't center around harming them anymore. I have other fears that creep up, but I would rather it take that form any day!
If you need to talk at all, let me know!