your body temperature is absolutely normal. Mild fluctuations do occur throughout the day, ranging between 97-99 ° F.Just maintain hydration & have a good diet.

Human body temperature varies as per timing of the day,Ranging from 99.5F from 10AM to 6PM& falling from 97.7 F from 2AM to 6AM.To be very preside lowest around 4AM during sleep & highest between 4PM & 6PM..So the average temp of human body is considered as 98.6F.There r other factors also which affects body temp like sec( male or female), age , health status( any illness) , exertion level , emotions, state of consciousness ( sleeping, walking, sedated) , part of where it is taken ( oral or arm pit & that is how wheather can affect ur reading, in summer readings in armpits can be high.)

Human beings r warm blooded, that means our body temperature is not dependent on the surrounding environment. It has a perfect temperature regulation mechanism which tries to maintain it at a constant level despite variations in surroundings. Your problem has nothing to do with Corona Virus. So relax. This is not fever.