My son has a fever of 101.8-100.8, what should I do?

My son has a fever, He is 2 years old. His temperature is 101.8-100.8. I took his temp from under his arm. All I want to know is if I need to take my son to a doctor in the morning.I gave him a bath when I realized he had a fever. when he got out he had the shakes and was cold instantly. The bath water was warm not to hot. I gave him Tylenol at 9:00 pm and then again at 1:00 am. But when I went to give him his second dose it did not feel like the fever was going down.

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