Hi, I have the same types of worries. I think there is something very evolutionarily (is that even a word?!) correct about that... such as the overwhelming urge to go check on your child while sleeping or that something is not right because it's too quiet. Or you worry about a hazard in your yard (a well, a stream, a busy road) but that also makes you hyper-alert to any potential for danger in those areas, and you prevent something bad from happening because of it.
I also wanted to add something else, too. I worked for 4 years in a world-renowned anxiety disorders clinic specializing in, among other things, OCD!
Whenever we were doing research studies, and had to interview and test "normal control subjects", you'd be amazed at how many "normal" people are preoccupied with obsessive thoughts much of the day.
Here's the delineator, though. If your obsessive thoughts (fears) are consistently interfering in your life or that of your family
, and/or, the fears/thoughts you are having are extremely distressing to you
, then you may have a problem. Otherwise, it's very common and nothing to worry about.
In fact, as I wrote, it is thought to be very self- (and child-) preserving in many cases!!