Of what happening? Having CPS called on you? I don't know, but I am as terrified of it, as your average helicopter mom would be of having their child scrape their knee, or be abducted by a stranger. I really hope the risk is as low as being abducted, though.
I hear you and my wife and I struggle with similar feelings! But taking a step back, I think it's plain that the actual risk from CPS over-reach is extremely low.