I have heard cases that alters are married in the inside world. But since rules are a little different there and you do not feel like you made this pregnancy, she might be pregnant sort of by herself? If you have the feeling it is going to be a birth of a new alter, maybe that is what is happening. There are no DSM5 rules of exactly when and how alters come to be. We are not allowed to diagnose people as psychotic here, and I think we're not allowed to diagnose alters either. I wouldn't know how to medicate just that alter even if it was the case.