It's been three months since Bristol Palin announced that she was pregnant, and time's flying because now she only has three months left until she welcomes her bundle of joy into this world.

The 24-year-old daughter of Sarah Palin took to Instagram and her blog on Tuesday to show off her growing baby bump in an all-black ensemble. "Start of my sixth month," she wrote. "Feeling like a tannnkk already! Eek."

Bristol is already mother to her 6-year-old son Tripp, whom she had with her ex-fiancé Levi Johnston, according to Us Weekly. She still has not revealed who the father of this baby is, but people believe it could be her other ex-fiancé Dakota Meyer since she called off their wedding shortly before she announced her pregnancy.

"I know this has been, and will be, a huge disappointment to my family, to my close friends, and to many of you," she wrote in the blog post which revealed she was pregnant again. "But please respect Tripp's and my privacy during this time. I do not want any lectures and I do not want any sympathy."

 Start of my sixth month, feeling like a tannnkk already! Eek

A photo posted by Bristol Palin (@bsmp2) on Aug 30, 2015 at 11:58am PDT