It is said that covid patient should not get vaccinated because:
Virus and vaccine both induce immunity in the body.
If the body responds to the virus (active infection /symptomatic) then the purpose of the vaccine is wasted.
Vaccine taken during symptoms (undiagnosed covid) will not harm the person.
But it's going to be of no use to the patient.
In health centres, you are asked if you have symptoms.
Only asymptomatic person is vaccinated.
Next Steps
if unsure, regarding symptoms check rtpcr before vaccination.