Most miscarriages occur before the 12th week of pregnancy. Signs and symptoms of a miscarriage might include: 
Vaginal spotting or bleeding
Pain or cramping in your abdomen or lower back
Fluid or tissue passing from your vagina
 If you have passed fetal tissue from your vagina, place it in a clean container and bring it to your health care provider's office or the hospital for analysis. Most women who have vaginal spotting or bleeding in the first trimester go on to have successful pregnancies.