This dream is not about your sister or even directly about your boss. The first principle of interpretation is that the dream is about the dreamer. Your mind uses the image of your sister to represent yourself. The pregnancy is something that you are "laboring" to develop. Since your boss is involved, the pregnancy probably represents an important project at work that is your responsibility.
That you need to feel like someone cares about you
Dreams are about the dreamer's own emotions, thoughts, urges, etc. So in her dream, "you" might represent your sister, and her own feeling about having a child. Or, her dream might be a metaphor showing how she feels the need for someone younger to love and care for, but tempered by her feeling unready for children of her own. There are endless possibilities, but you can be certain that your sister's dream does not mean you are pregnant. Or, if you are pregnant now, her dream does not determine the sex of your child. An Ultrasound can settle that matter.
This dream is a literal image of the figurative wish that your boss's mouth could be securely shut.
you might be pregnant!
The meaning of the dream depends on its emotional tone (fearful, happy, sentimental, etc.) as well as the content and context of the dream. For example, a dream about watching the sister drive away in a car would be very different from a dream of baking cookies together in granma's kitchen. Very generally, the dream expresses the dreamer's own feelings; it provides no information about the sister or her feelings.
This dream suggests that the dreamer feels a sense of guilt concerning the sister. The dream is not predicting any future event.
This means that you are experiencing a closer connection to your boss.
what does it mean when you dream your bestfriend is pregnant?
It probably means that your sister has been giving you a hard time.
Dreams are about the dreamer's own feelings and thoughts. In this dream, the sister-in-law could represent the dreamer, and her own suppressed desires and fears about becoming pregnant. Alternatively, the "pregnancy" and "baby" might symbolize some idea, project or task the dreamer or the dreamer's family has undertaken, and the dreamer's fears that the project will fail.
To dream about your daughter being pregnant basically means that a parent thinks that the daughter is practicing unprotected sex. In most cases, people dream about what they think.
The dream is showing you how the broken relationship with your sister is "stealing" your happiness. The image of your sister in the dream reflects yourself. In the language of dreams, you see yourself burglarizing your own valuables because of a value-less disagreement.