'I am...21 days old,' says 'GMA's' Robin Roberts

Robin Roberts is home.

ABC's "Good Morning America" updated viewers Thursday on the progress of its ailing co-anchor, who received a bone-marrow transplant three weeks ago to combat the blood disorder myelodysplastic syndrome.

Robin Roberts will begin medical leave from "Good Morning America" next week to undergo a bone-marrow transplant.

Here's an excerpt from Roberts' latest blog post:

"Home Sweet Home. That has never had quite so much meaning before.

"After exactly one month in the hospital dreaming of this day, I am finally home...This doesn’t mean that my journey is over.  Far from it.  I am considered 21 days old. That's how long it has been since my transplant. Remember when you brought your baby home for the first time? Your precious bundle didn't leave the house much and you were careful that anyone who came in contact with your child was healthy. So I will still be resting away from GMA until I'm given the all clear, but sleeping in my own bed again feels like a big victory."