You really should go to an after hours clinic or ER to get checked out. Im not sure what you meant by you looked like "Elvis" - can you elaborate a little more?
Fainting can be common during pregnancy and the most common causes are low blood pressure or low blood sugar. Its important to find out what happened in your case and if this is something that requires treatment (its a possibility). Certainly, if you were unconscious for 10 mins that is sometime that needs to be checked out asap because that is NOT normal.
had you eaten? were you shakey or nauseaus? Those are signs of low blood sugar, something I delt with during my early pregnancy.
Another problem I had was it seemed that my neck muscles would spasm, causing bloodflow to my head to slow and I'd get VERY faint for a few minutes. I never blacked out but I did come very very close to it, once in a store!