Post covid fever. Is it covid or what?

I have tested covid  positive on 31st of Oct.Then I was in covid centre for 11 days and in home quarantine for 7 days.during my last 3 days of home quarantine that is 14th 15th 16th day i again developed fever from 98.5-100.2 but never became 101.So I went to the doctor and he said to have 3 days home isolation with medicines.and after 3 days that is 19th day of home isolation also I am having same fever..I wanted to mention that I don't have fever for whole day ..in the morning upto 12pm I am normal no temp but after 12pm to 9pm my temp increases and reached upto 100.2 but mostly 99.8 or 99.9 with body aches and chilling feeling and after that my body temp start reducing and in night after 10pm my temp is normal without taking paracetamol or any medicines. I have tested dengue,typhoid,malaria but everything came negative. What is happening?is it covid or what?