The Bachelorette star Jenn Tran has admitted she's not sure she would have done the finale the same way if she could go back and do it all over again.

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The Bachelorette has been airing previews for months showing that Jenn's ending was "unprecedented" and will be a total shock to viewers when the Season 21 finale airs Tuesday, September 3 at 8PM ET/PT on ABC.

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In a preview of the special three-hour event, Jenn decides to follow her heart, which prompts The Bachelorette host Jesse Palmer to ask her, "Are you sure you want to do this?"

Jenn then nods her head "yes" in the clip.

On Tuesday's episode of Good Morning America, Jenn suggested that she's not sure she had made the right decision during her final days of filming in Hawaii.

"That moment with Jesse in which he asked me if I was sure if I was going to do this or not, I guess I could say now, like, I'm still not sure if I should've done that or not!" Jenn confessed on GMA.

The preview proceeds to show Jenn telling one of her Final 2 bachelors, either Devin Strader or Marcus Shoberg, "I cannot let you propose to me."

Jenn teased her finale as "a very emotional one," adding, "There are lots of twists and turns -- lots of surprises."

Jenn revealed that her Fantasy Suites with Devin, Marcus and Jonathon Johnson was a really pivotal time in her journey to find true love.

"I went into it really digging into the nitty-gritty of what our life is going to look like on the outside. [For instance], I'm going to be in [physician assistant] school. Is that going to be okay for our relationship?" Jenn shared.

Jenn apparently received some answers that solidified her decision during the Fantasy Suites, and as The Bachelorette viewers already saw at the start of The Men Tell All broadcast, she eliminated Jonathon in third place.

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The Men Tell All studio audience audibly gasped in unison when Jenn chose to give a rose to Marcus over Jonathon.

"I didn't expect such a big reaction to send Jonathon home, but I wasn't surprised because he is genuinely such an amazing guy," Jenn said.

"He's got such a good, good heart," she noted.

When summing up her Final 2 bachelors, Jenn gushed during her GMA appearance, "With Marcus, I envisioned a life with him in which we are able to kind of heal each other."

And with Devin, Jenn recalled, "We were unwaveringly there for each other."

The Bachelorette finale is going to feature Jenn "in love" with both guys and trying to choose between them with the help of her beloved mother and brother.

But it appears the guys are going to have some trouble winning Jenn's family over.

"I'd love to have your blessing to propose to her," Devin shares with Jenn's brother in the finale preview.

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"I'm definitely not going to give the blessing," Jenn brother's replies.

Marcus is also apparently put on the spot about not being deeply in love with Jenn or being ready to pop the question.

When Marcus can't provide reassurance and clarity, Jenn's brother warns The Bachelorette star, "Your history with people who are emotionally unavailable, how long are you willing to wait?"

RELATED LINK: 'THE BACHELOR' COUPLES NOW: WHO DID 'THE BACHELOR' STARS AND THEIR BACHELORETTE PICKS ACTUALLY END UP MARRYING? (PHOTOS)

Jenn points out how she doesn't want history to repeat itself, but Marcus is clearly "struggling" in the process.

"I know that I love you and I don't want to give up on us," Marcus cries to Jenn, who then acknowledges how they're running out of time.

The preview ends with Jenn wearing a white dress at the Final Rose Ceremony and admitting to the cameras, "What I'm about to do today is something I thought I would never do, but I have to do what's right for me."

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About The Author: Elizabeth Kwiatkowski
Elizabeth Kwiatkowski is Associate Editor of Reality TV World and has been covering the reality TV genre for more than a decade.