When my daughter was in school I called her in “sick” on plenty of occasions over the years when she was over tired, under the weather with allergies r simply needed a day off. I don’t know how the system works now, 20 years later but unless the absence was a week or more, no doctors note was ever required.
Unless I was vomiting or had chickenpox. I went to school. It was considered out of the question to miss even one day.
I’m sure my parents could have kept me home if they thought it was warranted.