The dream of an ex-wife being pregnant can symbolize a fear of responsibility and commitment. It may represent unresolved feelings towards the ex-partner and the fear of being tied down to them again. The pregnancy could also symbolize a new beginning or a new phase in the dreamer’s life, which may be causing anxiety and fear. Waking up terrified in a cold sweat suggests that the dreamer is feeling overwhelmed and anxious about the potential consequences of this new development. The question about the baby being theirs could indicate a desire for closure or clarity in the relationship. Overall, this dream may be a reflection of the dreamer’s inner conflicts and fears about their past relationship and their ability to handle new responsibilities and changes in their life.