I would highly recommend Dr. Sheri Hamersley at Maternal Fetal Medicine Associates of Maryland.
http://www.mfmofmd.com/ Her big specialty is working with patients who have experienced recurrent miscarriage. She treated me for immune problems and a blood clotting disorder (none of which I knew that I had until she gave me such thorough testing through lab work). Thanks to her wonderful treatment, I went on to have two healthy children. I would also recommend working with a reproductive endocrinologist who can monitor you very closely during the first trimester. Dr. Siu Wagner is in Rockville, and she is phenomenal. She is in private practice and calls you up personally with the results of your lab work. I can't say enough good things about her. I was very fortunate to work with both of these doctors - and they were also terrific about consulting each other because they respect each other's work highly.