See Bristol Palin's Growing Baby Bump in New Selfie
07/20/2015 AT 04:40 PM EDT
Sarah Palin's daughter took to Instagram last week to post a photo of herself in the dermatology office where she works as a medical assistant, giving fans the first glimpse of her tiny – but growing – pregnant belly.
Palin, wearing a black jacket and white top, is shown pursing her lips and holding up her cell phone in the photo, which she captioned: "Celebrated six years working for the best people I know .. This place is my home (I actually have a job #shocker)."
Palin announced on June 25 that she was pregnant with her second child.
"I've been trying my hardest to keep my chin up on this one. I know this has been, and will be, a huge disappointment to my family," she wrote in a blog post on the religious website Patheos. "But please respect Tripp's and my privacy during this time. I do not want any lectures and I do not want any sympathy."
Palin, 24, who has yet to reveal the identity of the child's father, was set to marry ex-fiancé Dakota Meyer, a former U.S. Marine, on May 23. However, her mother announced just days before the wedding that the couple had called off their two-month-long engagement.
Palin fired back at critics of her second out-of-wedlock pregnancy in another blog post, writing, "This pregnancy was actually planned. Everyone knows I wanted more kids, to have a bigger family. Believing I was heading that way, I got ahead of myself. Things didn't go as planned, but life keeps going. Life moves on."
Palin is already mom to Tripp, 6, her son with ex-fiancé Levi Johnston.