BabyCenter does have a TFMR board that is very active. They also offer a considering tx, ttc after tx, and parenting after tx for medical reasons.
If you go to their site and pull up the a-z list of boards. Look for Termination for Medical Reasons.
ezboards also has a public forum for TFMR as well. Do a search to find us
Both groups have a wonderful following of women who will support you no matter which choice you make