Pregnancy with a teratoma is generally considered safe, as the teratoma is a tumor located on the ovary and, if there is a pregnancy, the embryo develops within the uterus. Typically, the teratoma does not significantly affect the pregnancy, nor does the pregnancy greatly affect the teratoma, because they are not in the same organ. Therefore, it is usually acceptable to continue with the pregnancy in such cases. However, it is essential to undergo ultrasound examinations during pregnancy to monitor the development of the teratoma. If the teratoma increases in size, it is advisable to consider surgical removal after the first three months of pregnancy, as the baby is relatively larger and the surgery is generally safer at this stage.