I got my first Moderna shot yesterday about 11 AM, and by 7 PM my arm was getting sore, so I took a Tylenol. Woke up in the middle of the night with a bad headache, but it was gone by this morning. My arm is still sore, but not that bad.
My neighbor got his first dose on Monday, and his arm hurt a LOT by yesterday, plus he had a fever, but he had Covid already.