In Virginia, having a .20% blood alcohol concentration is enough for Virginia authorities to charge you for DUI. The legal limit by the way is just .08% so any amount higher than that automatically causes driving impairment. Virginia DUI law has zero tolerance for underage drivers but the court has a ruling that a .02% BAC level for drivers with age 21 years and below is enough for a dui conviction. 

Since Implied Consent Law is in effect in Virginia, it would be wise to submit yourself for a chemical test rather than having your license suspended just by test refusal. Either way, the officer who stopped you for DUI suspicion has already established the case against you prior to the stop. And even if your BAC is below the legal limit, just a simple sign of inconsistency will give you away.  

In order to avoid further problems, make sure you have a certified Virginia DUI Attorney to defend you in court and will question the credibilities of the test and also challenge the arresting officers for what they did to you. A good Virginia DUI Attorney is all you really need right now.