Story highlights On her blog, Bristol Palin announces that she's pregnant with her second child

"I know this has been, and will be, a huge disappointment to my family ... and to many of you," Palin writes

The news comes more than month after she called off her wedding

(CNN) More than a month after calling off her wedding, Bristol Palin revealed what she called "big news" in a blog post on Thursday: She's pregnant with her second child.

"I know this has been, and will be, a huge disappointment to my family, to my close friends, and to many of you," Palin wrote in a post on her blog , noting that she was making the announcement sooner than expected because online trolls "have nothing better to talk about."

"I wanted you guys to be the first to know that I am pregnant," Bristol Palin's Thursday blog post said. "Honestly, I've been trying my hardest to keep my chin up on this one."

Bristol Palin has stayed in the public eye since her mother's failed vice presidential bid through appearances on "Dancing With the Stars" and a Lifetime show about raising her son, "Bristol Palin: Life's a Tripp."

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