Do other places perform pregnancy blood tests?

Hi, I’m 7 days late for my period and have this strong gut feeling that I’m pregnant. I keep taking tests and they’re all coming up negative. I’ve read that it’s possible to get a positive pregnancy test starting at 6 weeks, and some women have lower HCG levels. I called my OB to see if I could come in to get a blood test, and they want me to wait a couple more weeks. Can I go to planned parenthood for blood work? Or do I just sit and wait it out? My periods have always been regular however I did recently come off birth control, so that’s why my doctor said she thinks it’s just an irregular period since my body is still trying to get in balance again. What do I do?! I see everyone getting a BFP at like 9 DPO-12DPO and feel like there aren’t many posts about women testing positive 2 weeks after a missed period so I’m feeling discouraged. Thanks girls!