My wife got her 2nd Pfizer shot this past Saturday. She had no reaction to it at all. She did pregame some acetaminophen, which might have helped keep fever and aches away.
I learned today that one of my coworker's entire family (coworker, husband, teenage son, toddler daughter) got COVID a couple of weeks ago, and are all doing better now. Their symptoms varied from mild to severe, but none required hospitalization, and they all recovered. Since they are younger, I'm certain they haven't been vaccinated.