Kylie Jenner moved quickly with rapper Travis Scott and now, as she awaits the birth of her first child, she is reportedly regretting it.

According to a new report, Jenner, who is just 20 years old, isn't sold on the idea of starting a family with Scott, and while she is hoping for the best, she fears that their relationship might not have a very happy ending.

“Kylie is beginning to wonder if becoming pregnant with Travis’s baby is the biggest mistake of her life,” a source close to the reality star told Hollywood Life on Feb. 1. “She is hoping for the best — that Travis will step up and be a great father — but she has her doubts."

As the insider explained, Jenner has been feeling quite alone as she prepares for the upcoming birth of her baby girl because her boyfriend, Scott, has been traveling the country on tour. Because of that, the source noted, Jenner is wondering if getting pregnant was the wrong decision, especially considering that her relationship with Scott was quite new at the time she conceived.

“Kylie’s pregnancy was not planned at all and was as much of a surprise to her as it was to Travis,” the insider explained. “She immediately knew she would keep the baby and is really excited about becoming a mother, but she really thought it would bring her and her new boyfriend at the time, Travis, closer together.”

While Jenner hoped to grow closer to Scott during her pregnancy, the couple has only been seen together a number of times since news broke of her pregnancy. The last time they were seen spending time with one another was over a month ago.

Even as Jenner's due date nears, she and Scott have reportedly remained unseen, and as they continue to spend more and more time apart, Jenner is said to be realizing that she truly made a bad decision in allowing herself to get pregnancy just weeks into their romance.

Jenner is also reportedly concerned about the amount of things she is going to have to give up after her child arrives -- and the things she's already given up. Meanwhile, her boyfriend seems to have been able to carry on with his life and career as if nothing has happened between them.

To see more of Kylie Jenner, her growing family, and her sisters Kourtney, Kim, and Khloe Kardashian, and Kendall Jenner, don't miss Keeping Up With the Kardashians when it returns to the E! Network on Feb. 11 at 9 p.m.

Tags: travis scott Kylie Jenner