Miscarriage is fairly common, occurring in up to 20% of pregnancies. Miscarriages are most likely to occur in the first 13 weeks of pregnancy, but they can occur as late as 20 weeks. Symptoms of a miscarriage include: Vaginal bleeding Passing tissue through the vagina Strong cramping If you’re experiencing vaginal bleeding with no cramping or only light cramping, you’re likely not miscarrying. The bleeding may very well stop on its own while the pregnancy continues.