Hi. I'm so sorry to hear about your losses. Just know that your babies are in the Father's hands and are being cared for. I had 3 and understand how painful it can be, especially when you don't know why. I remember reading about a woman, Marty Copeland, a well know Christian health/nutrition lady with a well known ministry. She had 7 miscarriages until she found out. There was a blood clotting disorder and she was treated with blood thining agents for a while. I have had the same problems, tested for blood clotting problems (positive and negative), been on thinners, even while preg. 1 missed misscarriage, one reg. miscarriage, one ectopic. You may want to get checked on that especially with 7. they usually do more testing after 3. I'd encourage you to go to a comforting ob/gyn specialist in high risk preg since you've had that many. God Bless.
An OBGYN would be the doctor for you to see. Sometimes the causes of miscarriages can be determined and treated - for instance if an infection or hormonal imbalance is to blame. An OBGYN will be able to run the appropriate tests and help you get to the bottom of this.