Fever and shots

Hi mamas yesterday my 10month old had had check up she has been behind on her shots from 6 months and yesterday she had to get 4 to get her caught up, she had never gotten a fever however

She has had a 101 fever

Last night at 10:40 pm 101 fever gave her Tylenol

4:24am 100.6 fever gave her more Tylenol

It has been taking almost 30-40 for the Tylenol to begin working

I’ve been giving her 2.5 ml

I’ve also been using a fore head thermometer 🌡

I hate this I’m a FTM and this fever stuff is freaking me out. Any advice ? How long do babies have fevers for after their shots ?