Always miscarriages, now going to the doctor.

Hi, I had another miscarriage yesterday. It wasn't very far along yet, but the shock is still huge. This is my 4th one, and my doctor is aware of 3 of them. I already had a feeling something was wrong again and quickly had a blood test done at the hospital, from which the doctor could see that I was indeed pregnant. I've now called the doctor to book an appointment for next Wednesday because I have 3 registered miscarriages now. I'm terrified but still want to continue at the hospital. Does anyone have any idea what kind of process awaits me there? On the internet, I only see forums with people who can't get pregnant, but I get pregnant every time within 3 months and then it goes wrong. (3x 4 weeks, 1x 9 weeks + 4 days pregnant) Does anyone have any idea?