It isn't a stupid question. It is a newbie question. New chicken owners, much like first-time parents are worried about absolutely everything. Experienced owners/parents have a much better idea of what to expect and what problems are serious.
If your chickens appear healthy, active, acting normally and their poo looks okay then they are fine. Poo does vary (color, wateriness, etc) from instance to instance, exactly as ours does. If you are concerned about their poo, feel free to post pictures in the
Emergencies / Diseases / Injuries and Cures forum for evaluation.
If/when you ever do have problems, I recommend you search on BYC and/or post a request for help in that same forum. The vast majority of issues can be self-diagnosed and treated without paying for an expensive vet visit.
PS- Even without knowing *anything* else about your chickens, they will almost certainly produce superior quality eggs than you commonly buy in stores just based on the fact that they have access to open grass.