Thank you for sharing your dream. It sounds quite intense and layered, reflecting a range of emotions and themes. Let's break it down.

1. Setting: The dock and the cruise ships can symbolize transitions and journeys. Watching the ships might indicate a desire to explore new experiences or feelings of being an observer in your own life. The contrast between the open water and the confined space of the room could signify feelings of freedom versus restriction.
2. Characters: Each character may represent different aspects of your life.
   • The new mother (NM) could symbolize nurturing, growth, or the support system you have.
   • The expecting mother (EM) might embody fears or anxieties about change, especially concerning motherhood or your own personal growth and identity.
   • The police officer (PO) could represent authority, protection, or a figure of judgment in your life.
3. Scene with the Expecting Mother: The darker aspects of the dream, especially with EM's unsettling behavior, could reflect your fears about the unknown, particularly related to motherhood and the responsibilities that come with it. The act of her laughing maniacally and the imagery of the fetus might symbolize anxieties about life choices, control, and the unpredictability of personal transformation.
4. Your Reaction: Your instinct to urge NM and PO to check on EM indicates a protective instinct, perhaps reflecting your own feelings of concern for others or the responsibility you feel in your relationships. The difficulty in expressing your thoughts and the physical sensations of fear and trembling may represent an internal struggle with expressing your own fears and boundaries.
5. Ending: The fetal imagery and your inability to articulate your feelings highlight a deep-seated fear or anxiety about something in your life that feels overwhelming or unmanageable. Closing your eyes and flinching suggests a desire to escape from or avoid confronting a painful truth or situation.

Overall, this dream seems to be a complex reflection of your feelings about change, identity, and the fears that accompany personal growth. It might be beneficial to explore these feelings further, perhaps through journaling or talking with someone you trust, to gain more clarity and understanding about the anxieties that surfaced in your dream. Remember, dreams often serve as a way for our subconscious to process emotions and experiences, so they can provide valuable insights into our waking life.