Walk-in Clinic for blood test?

Does anyone know where I can get blood testing done without an order from a Doctor? My Doctor doesn’t believe it’s necessary to do any more HcG and progesterone testing since the initial tests appear to be on track. I’ve had 2 miscarriages in the past and would like to monitor my hcg and progesterone to catch any potential drops before my 8 week ultrasound appointment.

Are there any walk-in clinics that offer blood test services in the Bay Area?

Thanks!