Yeah. I apparently missed a ton that the wiki talked about. Apparently her mom told Don she was under quarantine for tuberculosis to explain her extended absence. Don seeks her out and finds her in the hospital and encourages her to move forward and forget about the whole thing. It says that it is not clear whether he knows about the pregnancy, but he does know it wasn't tuberculosis. Because he's the only person who visited her, her mother and sister think Don was the father.