Temperature of 99. 3. To have that temp?

I am having temp above 99 n below 99.5 since 6 May. I tested negative. Doc suggested me to use Doxy, Azithromycin n other. During 5 days, I got temp 99.8 on 3rd. After 5 days I stopped, 3 days later got temp 99.8. Again took another medicine prescribed by doc. Same was repeated. After the medication I took only paracetamol nd multivitamin for 3 days temp<99.5 nd above 99. Then I stopped those two. From 5 days I am having temp like 99 to 99.3 on either evng or night. And temp is staying only for 2 to 4 hrs. Remaining day it is below that temp and normal. I took all the blood tests, CBC, CRP, WIDAL, SERUM FERRITIN, LDH, LFT, D DIMER, Malaria, jaundice, typhoid, dengue , chest scan, urine test and all are normal. Is it normal to have that temp