Pink discharge at 21 weeks of pregnancy is generally not normal. Generally in the process of pregnancy basically does not appear pink discharge, pink discharge indicates the emergence of bleeding symptoms, may have a certain relationship with the first sign of miscarriage, if the development of the fetus is unstable may lead to a small amount of placenta and uterine lining stripped, so there will be a pink secretion, this situation is not normal, need to be actively preservation of the fetus. Pink discharge during pregnancy may also be related to gynecological diseases, such as vaginitis, cervicitis, pelvic inflammatory disease and other gynecological inflammation, inflammatory secretion stimulation of mucous membranes may also appear bleeding symptoms, this situation is not normal, need to consult a doctor in time for examination and treatment. During pregnancy, you need to pay attention to personal hygiene and keep the pubic area clean.