Redness after eating watermelon after pregnancy belongs to the phenomenon of preeclampsia, which is not necessarily caused by eating watermelon. Eating too much watermelon during pregnancy may irritate the stomach and intestines, resulting in abdominal pain or diarrhea and other symptoms of gastroenteritis. IBS diarrhea can stimulate uterine contractions, which may cause abdominal pain, vaginal bleeding and other symptoms of miscarriage. Furthermore, if you eat cold watermelon refrigerated in the fridge, it may stimulate uterine contractions, which may also cause signs of miscarriage. After eating watermelon after pregnancy, you should pay attention to go to the hospital in time to check the condition of the fetus, if it is a sign of miscarriage can be given under the guidance of the doctor progesterone to protect the fetus, late pregnancy is recommended to use magnesium sulfate to inhibit contractions to protect the fetus. There are many reasons for the occurrence of red during pregnancy, such as low progesterone, maternal disease, traumatic stimulation, etc., and not necessarily caused by eating watermelon. It is also necessary to combine progesterone, blood HCG and ultrasound and other tests to clarify whether there are other causes, and treatment for the cause.