Reoccurring Chemical/early miscarriage

Ka
I'm going through my second one. Fiance and I have been ttc for a year and 4 months, got pregnant our second month of trying which ended in a chemical. It took my body a year and some change to heal from it. Just to get pregnant and it end the exact same way. I'm looking for those who have had this issue, and found out the reasoning and have gone on to have successful pregnancies after treatment. I would also be interested in knowing what you were diagnosed with and how they treated it. I've had a hard time getting my doctors to give me answers. All info is welcomed.