Blood test?

I've gotten faint positives for 2 days now. Tomorrow I'll be 11 dpo and have an appointment to go to my dr and get a blood test to confirm. 
I was further along in my last pregnancy when I first saw the doc, so I think I just peed on their stick and they confirmed it. 
When I go in for the blood test, will I know right there, or is it the kind of test they have to send off?