This may not be far enough downtown for you, but I've seen Kate Marosek, whose office is walking distance from the Cleveland Park Metro. I thought she was nice; I only saw her twice so I don't know how she would be long-term, but fertility issues are one of her specialties.
Katherine Ridinger Marosek, LICSW
4545 Connecticut Avenue, Apartment 417
Washington, DC 20008-6021
Phone: 202.296.1080
And here's a list of more in the DC area. I cut and paste this from a RESOLVE web page. I don't have personal experience with them.
Cindy Bare
Pastoral Counseling & Consultation Center of Greater Washington
7003 Piney Branch Road Northwest
Washington, DC 20012
Phone: 202.449.3789 x705
http://www.pastoralcounselingdc.com/
Lisa Catapano, MD, PhD
Department of Psychiatry
George Washington University
2150 Pennsylvania Ave Northwest
Washington DC 20037
Phone: 202.741.2886
Brian Cross, PhD, PLLC
4840 MacArthur Boulevard NW, Suite 205
Washington, DC 20007
Phone: 202.337.9555
http://www.briancrossphd.com
Tandy Levine, LCSW
Tandy Levine, LCSW and Associates
1808 Connecticut Avenue NW, Suite 102
Washington, DC 20009
Phone: 202.462.8558
http://www.tandylevine.com
Erin Peterson, Ph.D.
1350 Connecticut Avenue NW, Suite 1225
Washington, DC 20036
Phone: 703.298.7582
http://www.drerinpeterson.com
Debra J. Walther, PhD
2029 P Street NW, Suite 302
Washington, DC 20036.6903
Phone: 202.466.5538
Fax: 202.466.5546
http://www.DrDebraWalther.com
Rachel Wernicke, PhD
4545 42nd Street NW, Suite 202
Washington, DC 20016
Phone: 571.236.1261
http://www.rachelwernicke.com