The short answer
It is common: around one in four or five pregnant women notice some spotting, and most go on to have normal pregnancies. Still, have it checked to rule out threatened miscarriage, ectopic pregnancy or a cervical cause. Light spotting can be assessed at a daytime visit; heavy bleeding needs urgent care.
Answered by Dami Women's Clinic (다미산부인과의원), Yeouido, Seoul · Dr. Ko Sang-hyun, OB/GYN. General information, not a diagnosis. Emergencies in Korea: call 119. Medical disclaimer · International Patient Center