How much?

Haley • Married to my high school sweetheart. 9/21/13
How much is it to get blood drawn for a pregnancy test? I'm located in Southeast texas. Should I just go to my regular doctor for it? I'm almost 3 weeks late and I've always had a normal cycle. I have been feeling crampy for over a week now, but still no sign of af. Hpt keep coming up negative.