Khloé Kardashian and Tristan Thompson's surrogate was already pregnant with their baby when the NBA star's cheating scandal surfaced in December, a source tells PEOPLE.
The source tells PEOPLE that despite the pair expecting a sibling for 4-year-old daughter True, "Khloé and Tristan are not back together and have not spoken since December outside of co-parenting matters."
In January, Thompson, 31, confirmed he fathered a child with Maralee Nichols, writing in an Instagram Story in part, "I take full responsibility for my actions. Now that paternity has been established I look forward to amicably raising our son."