Where a Gynaecologist deals with the health and wellbeing of the female reproductive system, an Obstetrician specializes in pregnancy, childbirth and postpartum care. A Gynaecologist is trained in Obstetrics too. Hence, when a woman is pregnant, she can either consult a Gynaecologist or an Obstetrician, but for issues related to the female reproductive system, she should consult with a Gynecologist.