Pregnancy is all about the creation and development of life, so dreaming of being pregnant may be a metaphor for the birth of something in your life, such as a new idea, project or goal. It may also symbolize an aspect of yourself that is developing or growing.
Police in a dream may represent the law, rules, authority or control.
A dream about a swimming pool or any pool of water may be referring to the unconscious and/or your emotions; may suggest that you are exploring your unconscious and trying to get to know, understand and appreciate yourself more.
Whether you are painting a wall or other structure, painting a picture, or looking at a painting, each may be a pun on one of the others, so be sure to consider all of the possible interpretations. In all cases, you should also consider your associations to the color of the paint and what you are painting.
The characters or people in dreams can mean or represent many different things depending upon whether they are known or unknown to you and/or your relationship and recent interactions with them in waking life.