Family history of miscarriages

Brooklyne

So I had a miscarriage in December and asked my OBGYN if it could be because of low progestrone because my mom had 3 miscarriages and my grandma had 4. They couldn't carry a baby until they gave them progestrone. She said she would test me but she can't do anything until I have another miscarriage. Why is this? I don't want to lose another baby.