Dreams can often blend various elements of our subconscious thoughts, fears, and desires. Let's break down some of the key components of your dream:

1. Pregnancy as a Male: This could symbolize the birth of new ideas, creativity, or projects in your life. Your wish for a girl might reflect a desire for a softer, nurturing aspect of yourself or a wish for something new and different to emerge in your life.
2. Hotel and Amusement Park: Staying in a hotel suggests a temporary phase or transition in your life. The amusement park could represent excitement, adventure, or the unpredictability of life.
3. Being Followed by a Serial Killer: This element of the dream may indicate feelings of anxiety or fear in your waking life. It could symbolize a threat, whether it’s a personal issue or external pressures you feel are stalking you.
4. Walking on Roofs: Evading the killer by walking on roofs suggests resourcefulness and finding unique solutions to avoid problems. It indicates a desire for freedom or perspective in your current situation.
5. Entering a Mansion: Mansions often symbolize wealth, comfort, and the exploration of one's inner self. Exiting unnoticed may suggest a desire to escape from pressures or responsibilities.
6. Feeling of Labor: This could symbolize the anticipation or pressure of having to 'give birth' to something new in your life, whether it’s a project, relationship, or personal growth.
7. Being Pickpocketed: Losing your wallet might indicate feelings of loss or vulnerability. It could suggest concerns about your identity or resources, possibly hinting at anxiety over losing control or power in a situation.

Overall, your dream seems to reflect a mixture of creativity, anxiety about external threats, and a journey of self-discovery. It may be beneficial to reflect on aspects of your life that feel overwhelming or that you wish to change. Consider what new beginnings you might be nurturing and how you can navigate any fears or challenges you are currently facing.