<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing regurgitation, pain during pregnancy, vomiting, sharp abdominal pain, and even vomiting blood. What could be the problem?  <response>: The symptoms you have described are characteristic of pyloric stenosis. It is a condition in which the muscle in the lower part of your stomach becomes abnormally thickened, leading to blockage of food and vomiting. I recommend that you undergo further tests and imaging to confirm the diagnosis and receive appropriate treatment. 