No issues and I feel fine. Not sure if this is a good thing or not. I’ve read if you have a reaction it shows your immune system is working
Just had third Covid jab: No issues and I feel fine... - PMRGCAuk
Just had third Covid jab


Hi Rosina1871. I had my first two vaccinations with no reaction at all but an antibody test (carried out by a lifelong survey I'm part of) showed significant antibodies present in my blood afterwards. This of course was not an indicator of how strong my immune response would be though.
My own experience and research on this matter strongly suggests that a reaction or non-reaction of any sort to the vaccinations is not a reliable or true indicator of how strong an immune response your body has mustered and of course this will be different in each individual person and determined by several other factors also.

As Kendrew says, there is no iron-clad link between vaccine and reaction and developing immunity. A reaction post-vacc does suggest the immune system is doing something but since it takes up to 2 weeks for immunity to develop and most reactions happen in the first few days it is questionable what.