Worst Drs appt ever! I cried! But did any of your LO get a reaction to the MMR shot?? I know they said 7-10 days, and my LO came down with a fever exactly a week later. This past Monday she came down with a fever, gave her Tylenol, she was fine all day tues and Wednesday night had another fever and threw up. Stayed home from daycare thurs and was fine all day. Fri she went back to daycare then threw up at 2am but no fever. Fine sat fine but fussy Sunday and now has a fever again. Is this vaccine related or could it be a virus?? How long do the fevers from the vaccines last??