It will depend mainly on the reason for the bleeding. Generally, light bleeding is not a cause for concern, it is considered normal. However, if it is heavy, painful or prolonged, it may be indicative of a pregnancy complication and it is advisable to see a doctor.
Read the full article on: Is bleeding in pregnancy normal? What are the causes? ( 79).

Sara Salgado
B.Sc., M.Sc.
Embryologist
Degree in Biochemistry and Molecular Biology from the University of the Basque Country (UPV/EHU). Master's Degree in Human Assisted Reproduction from the Complutense University of Madrid (UCM). Certificate of University Expert in Genetic Diagnosis Techniques from the University of Valencia (UV).