"Maybe I was naive. I had not expected that people would think I was making up a medical need for an abortion or other things, like people accusing me of getting pregnant on purpose so I could do this as a publicity stunt," she said, adding that she was "astonished" at the level of hatred some people have for her.
The Family Research Council, which promotes "faith, family and freedom," published a blog calling Jackson's decision a "tragedy."
"The tragedy is that the woman in the video will never know her terminated child's potential," reads the blog, referring to Jackson's YouTube video.
Jeanne Monahan, the director for the Center for Human Dignity at FRC, said that she "feels sorry" for Jackson.
"I certainly don't agree with her decision to have a medical abortion," said Monahan. "In my heart I believe it's not good for her or her baby."
"I don't believe that with all of the evidence out there in terms of psychological effects this decision is going to help her to deal or help her to be a better mother, it's going to add to her problems," she said.
Despite some of the harshest criticisms, Jackson said that only about a third of the responses have been negative, and the rest have been messages of support, including many from women thanking her for explaining a process they don't fully understand.
"The overwhelming sentiment is, 'Thank you for talking about something that is hard to talk about,'" said Jackson, who said that she heard from one young woman about to start taking RU-486 today who was inspired to tweet her experience. Both will use the hash tag symbol and the phrase "livetweetingabortion" to categorize their posts on Twitter.
Jackson said she's not letting the critics get to her. Just as she appreciates the opportunity to discuss her beliefs, she thinks others should be able to do the same.
"I'm not trying to ignite a culture war, I'm just offering one person's personal experience and true story."