Had temp of 101. 9f for few min. Night!

I am 30 year male last night I roost my temperature it was 101.9f but I checked it Again for about 5 times gap it was around 97.5 to 97.8 never reached that 101.9 again till now should I seek for medical attention or it’s some problem with that thermometer i a bit obese so my normal body temperature rise till 99f some time I the evening but that too won’t be stable I will decrease in a few min so that I have took covid test also I came back negative plz give your suggestion apart from that I don’t have any symptoms like cough or any and also a hypochondriac worry lot about health issues so plz help me on this I was very much worried two week back I had cold and that too was just nose block and I was gone in 2 days I also checked for smell and taste test but every thing is fine only one time i had a temp of 101.9f nothing is abnormal than that also my anxiety is getting it's phase because of it i was very active apart from the temperature and the recently temperature was 98.1f Af night