Diarrhea in 16 weeks of pregnancy will not affect the fetus, if the pregnant woman’s diarrhea symptoms are relatively mild, just about 1-3 times of diarrhea, and there is no abdominal pain, nausea, vomiting, fever and other physical discomfort, most of the diarrhea symptoms will be cured and will not affect the fetus. If the diarrhea symptoms are more serious and the number of times of diarrhea is more, for example, about 5-10 times, you can prepare your own probiotic treatment, commonly used probiotics are Clostridium Typhimurium tablets, Bacillus Coagulans or Bacillus subtilis capsules, etc., and you can take the above mentioned probiotic treatment orally appropriately, and it is not much of a problem if the symptoms get better. If the probiotics are still ineffective, then you need to go to the hospital and cooperate with the doctor to give examination and treatment, not to delay, resulting in worsening of diarrhea symptoms, which may affect the fetus.