My 13 MO son had the MMR plus the booster of PCV yesterday morning. He was up crying and roastingly hot all night (no sleep for me) plus this morning his face was covered in spots. Now everything I have read says 1-2 weeks later you may get a rash but 24 hours?? He's had a temp of 37.8 all day, won't eat and has a horrendous cold. I'm just wondering if it's something else as I'm not sure it's possible to have a rash that fast...any advice?