MMR vaccine reaction

SKD • Lost my baby girl at 20 weeks February 2015. Rainbow baby boy born January 20, 2016🌈👶🏼. Early MC May 4, 2017. Second Rainbow baby boy born March 18, 2018!🌈👶🏼 💗Shayla Rose👼🏼💗 💙Royal Holden👶🏼💙 Lucas Stephen 👶🏻💙
So, my son had his one year check up about 12 days ago.  He had both the MMR and chickenpox vaccines.  He broke out in a terrible rash yesterday 😕.  My husband brought him to the doctor and she said it's just a reaction.  It seriously looks like measles!  But he is fine otherwise.  He Only had a slight fever that went away. Anyone else go through this?  Stats say it only happens to 5%.