4 month old fever from vaccines?

My son had 2 vaccines yesterday and he was fuzzy the whole day then developed a 100 degree fever at night I gave him some Tylenol he couldn’t sleep he was very fuzzy and crying and today I woke up checked his temperature and it’s 99 F.. how long does a fever last after vaccines? I’m a little worried I hope it’s nothing else all my other 3 children never developed a fever after vaccines