Is there something wrong with me?

I’m a new mom of a now 1 year old and natural I’ve been very protective of my son. Sometimes overboard because I had a loss previously at 6 months. I’ve healed from this and I enjoy my son! But lately there’s been this voice in my head saying things I know the family around me would NEVER do to my baby, and I can’t shake it. I keep thinking someone will abuse my baby physically or even sexual and I GENUINELY don’t know why! It brings me to tears to think this about my mother or even my own husband! I’d never been abused so I don’t know where this traumatic idea is coming from. Is this normal to think like this?! I’m supposed to be returning to work and my family is going to help watch our son but it gives me so much anxiety because of this little voice that won’t quit no matter how much I know that wouldn’t be the case.