Recurrent miscarriages at 5-6 weeks

Has anyone had recurrent miscarriages at 5-6 weeks? If so, were the doctors able to find a reason/change something for your next pregnancy so that it could be successful? I know they say that miscarriages are often unexplainable, but it's happened to me twice (maybe 3 times), and it almost seems too much to be a coincidence.