My doctor won’t prescribe progesterone

I’m currently four weeks pregnant. I had a doctors appointment and I asked my doctor if they could prescribe me for Progesterone and they said no. They said that they’ll prescribe progesterone when someone has had 5 to 6 miscarriages. I asked if they’ll test for low progesterone and they said no they won’t do that either. I went online and I went to a website and got blood work done for my hCG levels and progesterone done. I’m wondering if My progesterone comes back low can I take that in there to them and if they would prescribed me progesterone. What other ways am I able to get progesterone without my doctor having to prescribe it.???