I think that’s a good possibility too, but I’m still thrown off with the pregnancy. Most parents know that babies are expensive and a lot of work and if you are already having marital problems, a new baby is the last thing you need.
It makes no sense that he wanted another baby with SW since he was having an extramarital affair. (And we all know an affair is a symptom of a failing marriage, not the cause of a failed marriage) And SW was heavily involved with her job that required traveling and being away from the family. So, did she just find her self pregnant, unexpectedly? Did she think having another baby, hopefully a boy, would make things better with her husband? Did it anger him instead? Did she threaten to leave and go back to NC? Did that anger him even more?
So many possibilities here.