Dr prescribed Progesterone even though levels are good


I had a missed miscarriage last Dec but not due to low Progesterone. I am pregnant again and after initial blood tests my dr prescribed Progesterone suppositories even though my levels are good. I asked the nurse who gave me the recommendation from the dr over the phone (I haven’t seen my dr yet, just blood tests) and she said probably “because of my history” but confirmed my levels are good now and have never been an issue. Thoughts?