The side effects like fever, swelling and such are just the innate immune system response. It doesn’t necessarily give any indication of the adaptive system’s response. Some people’s innate system is prone to overreaction.I don't appear to have a sore throat this morning. We have a doctor in the family who told me that having a side effect isn't a bad thing, it's the result of my immune response fighting.
I only came across this thread yesterday, tl;dr the whole thing, I imagine this has been mentioned before.
My wife had her 1st jab at the same time as me, no side effects for her.