Really needing positive vibes!

I am wanting to be excited about this pregnancy but it scares me so bad. This is my 3rd pregnancy in 4 months. My last 2 pregnancies ended in early miscarriages. My doctor thinks it’s due to luteal phase deficiency of progesterone. So he had me start prometrium 200mg 24 hrs after a positive OPK. When I got my positive yesterday he upped it to 200mg 2x a day. I keep crying I’m so terrified of going through all the sadness again! I want to be excited and I am but the fear of losing this baby is so heavy on my mind! Anyone who has has success or positive vibes please!