It is not uncommon to feel unusual sensations during pregnancy, including a feeling of something "breathing" in the pelvic area. This can be attributed to various factors such as increased blood flow, hormonal changes, and the growing uterus putting pressure on surrounding organs. However, if you are experiencing any pain, discomfort, or other concerning symptoms along with this sensation, it is important to consult your healthcare provider for further evaluation. They will be able to assess your specific situation and provide appropriate guidance and reassurance.