Multiple Miscarriages

So I am currently going through my 2nd chemical in 3 months! I had a MMC last August. I have a happy, healthy 2 year old and had a perfect pregnancy with her! What’s the deal?! I can get pregnant, just not stay pregnant 😭 I have an appt with my doctor in a couple weeks, just wanting to hear others stories who have had multiple miscarriages and what you did?