Ok so either she's lying or the same thing that happened to her Husband will happen to him. I guess some sort of curse that will cause him to fall ill a few years after their child is born? Also this chapter had creepy/horror vibes.
if MC was smart he should ask "if that's true then why did you ask me if I did it before ? shouldn't you have known sence I was alive anyway ? is it because your husband died ? do I have a limted time to live after s** or something?"