4 month old with fever after shots

M.
Now i know this is an expected symptom after their shots but he had a temp at 7:30pm and 9pm of 100.5 now its 10pm and went up to 101.8. Where should I start to be more concerned I'm a first time mom and little to no experience when it comes to fevers. I only gave him tylenol at 7:30pm and wet cloths and a bath but hasn't brought it down. :/ any advice? I just want to have an idea as to when I should worry more than its just a minor symptom. Thanks in advance! 

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