4 month shots

Ta
My son got his 4 month shots yesterday around 10am and has been running a fever since about 6pm yesterday evening. The highest it got was 102 last night around 0130. I gave him more Tylenol and it broke until again this morning around 0830 it was back up to 101.2. I did give him more and it broke, but how long should I expect him to run a fever like this? Should I contact his doctor? 
I did get the shot handouts they gave and it said fever could happen, but just wondering from personal experience as this is my first baby and it makes me nervous. 

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