Oo normal yan, mommy! A few of us had the same experience with our kids after flu vaccine, ang immune system lang nila is doing its job, kaya may mild fever for a few days. But if ang fever ay umabot na 39°+ or hindi bumaba pa after 3-4 days, or kung may ibang symptoms like persistent vomiting or unusual rash, better check with the pedia para sure lang, okay?