Question: is blair waldorf really pregnant in season 5

Answer: Yes, Though she insists that she is in love with Louis, Blair begins to seek Chuck out as the season progresses. The two eventually declare their love for each other prior to a car accident in her limousine while being chased by paparazzi. Though both recover, Blair suffers a miscarriage from the crash. After the crash Blair decides that she must commit herself to Louis, converting to Catholicism and cutting off any connection with Chuck. At the wedding, Gossip Girl releases a recording of Blair confessing her love for Chuck. Nevertheless, Louis and Blair get married, making Blair a Princess of Monaco, though Louis informs her that they will have a loveless marriage of convenience. She then receives support from Dan, leading them to share a kiss on Valentine's Day. Amidst these developments, Blair grows conflicted between her feelings for Dan and Chuck. After taking steps to end her marriage, she chooses to begin a romantic relationship with Dan. By the end of the season, however, after a debate about which love is the best--with Dan she feels safe, with Chuck she feels vulnerable--Blair declares that she is still in love with Chuck, and chooses to pursue him.