Must have rolled single digit for my Constitution

I got my Covid-19 booster shot on Friday. It was my first Pfizer Comirnaty shot, as my 1st and 2nd doses were AstraZeneca. This time there was a throbbing pain on my arm at the injection site. Followed by a low-grade fever on the second day (yesterday). On my first dose I had a fever as well. This one seems to have mostly burned out in a day. Although the doctor said I could treat it with Panadol, I didn't. Nothing too serious anyway.