
According to WebMD, signs and symptoms of a
miscarriage include spotting, vaginal
bleeding that progresses from light to heavy, cramps, abdominal or back pain, fever, weakness, and/or vomiting. If you are concerned about miscarriage, you should see your OB-GYN, who can order lab tests (e.g., beta-hCG) and/or imaging tests (e.g., obstetrical ultrasound).
Source: https://www.webmd.