Waiting to miscarry again..

4w4d my HCG was 35 progesterone 4.4. At 5w4d my HCG was 1203 progesterone 3.6. I've had two miscarriages already due to low progesterone and now I know that this one will probably be the third. My doctor won't put me on supplements because he's pretty sure it will be another miscarriage also. I'm now 6w1d and have an ultrasound scheduled for July 11 to see if it is viable if I continue to carry by then. Last pregnancy I made it to an ultrasound it was an empty sac so basically all my hope is gone for this one as well. I feel like my heart has been crushed.. 💔