According to The Definitive Guide to Snake Dreams, a snake dream during pregnancy can be interpreted as a test of intuition, a warning about a tense situation or a call for the dreamer to pay attention to their inner guidance. The dreamer can also create their own meaning.
The Huffington Post notes that dreams about being pregnant are extremely common. As of 2014, nobody understands why dreams actually occur, according to About.com.
Although dream interpretations are not scientifically proven to be accurate, many experts do believe that dreams have real significance and meaning. Dream interpretation has grown increasingly popular since the 1970s.