On Tuesday, TMZ posted video footage from October 2017 showing Thompson kissing one woman and being groped by another at a Washington, D.C. hookah lounge.
Related: Tristan Thompson allegedly cheating on Khloé Kardashian with multiple women, reports say
Kardashian was thankful when she announced her pregnancy in a Dec. 20 Instagram post.
"I had been waiting and wondering but God had a plan all along. He knew what He was doing," Kardashian captioned the post. "I simply had to trust in Him and be patient. I still at times can't believe that our love created life! Tristan, thank you for loving me the way that you do! Thank you for treating me like a Queen! Thank you for making me feel beautiful at all stages! Tristan, most of all, Thank you for making me a MOMMY!!!"
Related: Khloe Kardashian confirms pregnancy: ‘My greatest dream realized’
It’s the first child for Kardashian and the second child for Thompson. The 27-year-old has a 16-month-old son named Prince Oliver from a previous relationship.
Kardashain joins her half-sister, Kylie Jenner, and older sister, Kim Kardashian, in motherhood this year. Kim Kardashian and Kanye West welcomed a third child, daughter Chicago West, via gestational carrier Jan. 15. Jenner and her boyfriend, rapper Travis Scott, gave birth to her first child, daughter Stormi Webster, Feb, 1.