Ladies, I need advice!

I know this answer may vary for each State but I have to ask. 
I don't have a doctor. To get one it will take 3+ weeks. I NEED a blood test to see if I'm pregnant or not. Can I go to any OB? I've also seen some go to the ER but it's not an emergency..I'm just a little stuck?! 
--I'm 12 days late for my period and getting BFN at home test results..