I will say this blueplum, it is nice to see people thinking about this vaccine, how long it takes to work, ect. Your question has to do with could something bad come from vaccine in a short amount of time.
While I highly recommend searching through all phases of the system I will leave you with this. That tiny synthetic mRNA that starts the process, could not make it to the starting line before they came up with this lipid casing.
In the past as soon as our immune system saw that foriegn mRNA it immediately identified it as bad and killed it. We now hide it from our own immune system to get it to the cells.
Think about that. Our immune system is screaming no, and we have to find a way around that. A way around our own immune system........so we can help our immune system? Wait, what?
Not a good idea to sneak around the railroad crossing gate when the arms are down and the lights flashing. Not a good outcome.