This is about work and preparation toward mental wealth. What in the world is mental wealth. I think I am wealthy and so I am? or Is it that I have a wealth of ideas on the mental plane today? Lucky ideas?
The pigs are in the enclosure of your consciousness and cannot again become submerged in the Unconscious.
The pregnant mouse is the card of poverty: poor as a mouse.
There is also emotional stress and the feel of threat (you might feel very small in a much larger world). Are you focusing on lack and in need of support?
The mouse also tells us to be patient. The seeds are planted and will take some time to develop and be delivered, like a baby.