How can a pregnant woman act to prevent her husband from marrying another, while desiring to preserve her home and avoid divorce?

It is not permissible for a wife to seek divorce merely because she dislikes being a second wife, for polygyny is permissible for a man who is able to be just. A severe warning has been reported for those who seek divorce without harm. A wife can try to convince her husband to refrain from a second marriage if there is no need for it. However, if he insists, she must be patient and live with him in kindness, for divorce is not a minor matter due to its demolition of the family and its psychological and social harms.