
PeachBlossomGoddess:
Well he can't be sure that she is not pregnant. If she is lying, he can always get her later on. In some ways, by not saving her from Wufeng, we already can see he doesn't really believe her.
If he captures her, she'll be allowed to give birth to his child and executed following the birth like Lady Wuji.
She was let go. Wufeng will come after her. So, is she pregnant or not? I think she is not. Because GSJ is a smart man. He could read pulses as all Gong men who have passed the trials know medicine and how to cure those who get poisoned. That's why we never saw a baby bump on SGQ.
Did he love her? Yes, he realised that he loved her on the day of the Lantern Day Festival.