Kinda but not really. After the beach date and the talk, the plot branches (either Police or Investigator) and afterwards there's one scene in the School reunion and even a talk just before reaching 100. I imagine it differs in cases one ignored the cheating or confronted her and actively asked her to keep doing it. Other than that, the three extra NTR scenes are on Sundays during Home dates, Halloween and with Dwayne (need to plant a camera in his office). I am not sure she can get pregnant from those events, unlike Samantha who'll randomly be pregnant after some time after her wedding. If she is pregnant when you marry her, the baby will quite obviously not be Mike's.