Ok so today is the third day and my girl twin still has an elevated fever, about 101.6 and will go…

Ok so today is the third day and my girl twin still has an elevated fever, about 101.6 and will go down to 100.9. She is also not her usual self. And both still are not eating as good as they were before fever. I posted before that my twins just had their MMR shot a little over a week ago and doctor said fever and stuff could start between 7 and 21 days after shot. So it started on the 8th day for them. My boy twins fever has been lowered since yesterday to 99.2 about, but my girl twin has not gone below 100. Everything on the internet says if fever last more then 3 days call doctor. I'm kinda worried because this is the third day, so if it's not gone by morning I'm going to be calling. Anyone else go through this with a vaccine? Never had this happen before with my first son.