If the pain in the stomach is caused by the fetal heart in the 6th week of pregnancy, it needs medication to preserve the fetus, and if it is caused by acute gastroenteritis, it needs medication and rehydration therapy. 1. Pre-eclampsia: can cause symptoms of stomach pain, can also be accompanied by a small amount of vaginal bleeding, ultrasound suggests that the embryo is well-developed and fetal heart, combined with clinical symptoms and progesterone, blood HCG (human chorionic gonadotropin) levels to assist in the diagnosis. It is necessary to pay attention to appropriate rest, and give progesterone and other drugs to protect the fetus. 2. Acute gastroenteritis: it can also cause stomach pain, diarrhea, vomiting and other symptoms, and most of them have a history of unclean food and drink, combined with the medical history and clinical manifestations can help diagnosis. You need to follow the doctor’s instructions to give montelukast and other medication, diarrhea is serious need to actively rehydration therapy. If you have fetal heartburn at 6 weeks of pregnancy, you need to be actively treated under the guidance of a physician.