A teratoma is a type of germ cell tumor that may contain several types of body tissue and is often formed in a woman's ovaries. While teratomas themselves do not cause symptoms of pregnancy, they can cause complications that may resemble pregnancy symptoms, such as abdominal discomfort, bloating, or changes in menstruation. In more severe cases, they can also cause severe abdominal pain and swelling. However, in order to officially diagnose and determine the nature of your case, it is best to consult a healthcare provider. They can conduct a thorough evaluation and guide you on the appropriate steps forward.