I would say 2 days calling in sick - unless they were in a row would put me on their radar. 1x if I called in sick when I was on the "must be in times". It would be less questioned if I called out stick 3 or 4 days in a row. But just for one day? They are going to question.

It doesn't matter what you say... if you call out sick, they don't bring you up on disiplinary proceedings for that... they start noticing that x wasn't done on time. Or that you were late three time last month. That is the game.

The people who get leave are their favorites.