If it is viral fever, there is no role of antibiotic. Antibiotic don't kill virus.
However, in any case if acute febrile illness, the standard protocol is to take Paracetamol, and symptom based treatment initially. If fever is persistent for more than 5 days , need to do evaluation by clinical examination, investigations as per detailed history and examination findings.
Based on the report, next course of action is decided.
Next Steps
Get COVID 19 RTPCR test done for now.
Take paracetamol
continue regular medicines
Observe for any other symptom
monitor blood pressure, pulse rate, oxygen saturation daily basis.
Consult doctor