Bristol Palin is pregnant again. In a depressed-sounding blog post ("Honestly, I’ve been trying my hardest to keep my chin up on this one"), Palin says she decided to announce her pregnancy early because "constant trolls" have been speculating on the rumor mill. Palin, whose planned wedding was recently called off, doesn't address who the father is. "I know this has been, and will be, a huge disappointment to my family, to my close friends, and to many of you," she writes, but "Tripp, this new baby, and I will all be fine, because God is merciful." (More Bristol Palin stories.)