Kylie Jenner was pregnant and alone!

The KUTWK star recently told Tyga she was expecting a baby, and sources revealed exclusively to Life & Style that the couple got into a huge fight and called off their relationship.

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“They’d made a pact that if she got pregnant they would get married,”says the source. “Instead, they broke up.”

While the pregnancy turned out to be a false alarm, friends and family are worried Kylie, 19, could end up as a single mom.

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"They’ve talked it through and have come to the conclusion that Kylie is uncoachable when it comes to Tyga,” says the insider.

For more on your favorite celebrities, pick up the latest issue of Life & Style, on newsstands now! And scroll through the gallery below for a look at Kylie and Tyga’s cutest moments.