This is probably the toughest decision to get from a school after applying under Early Action. Once your mid-year grades arrive, your files will be reviewed again during the Regular Decision round. At this point, you should simply make sure your mid-year report is sent when the grades from the first semester or second trimester are ready. Most of your counselors will do this automatically.
Feel free chat here. You should have already seen the link to the defer FAQ page, which answers the most common questions.
CavDog hopes you find a peaceful place to wait