Nothing to be worried at all right now just Paracetamol will help with that kindly share your weight for the correct dosing of paracetamol . Yes it’s purely he after effect of vaccination since you had developed it within 24 hours of your dose
Any other symptoms you are facing beside fever.
Next Steps
For further clarification, complete evaluation, correct diagnosis and treatment and prescription feel free to consult me on this PRACTO APP. Stay safe and take care of yourself