In Virginia, can my employer hold my check if I put in my 2 week notice, and did not show up on the last few days?

Your current employer has to pay you for all hours that you did work during that particular pay period.  If you are paid hourly, they just count the hours actually worked. If you are salaried, the usual amount may be reduced pro rata based on how many days you actually worked.  They generally don’t have to pay you outside their typical pay schedule, so if you are paid biweekly, you should be paid at the end of whatever two-week period during which you quit.