There are more reasons for chest pain on the sixth day of embryo transfer, and the common ones are the use of hormonal drugs, successful pregnancy, improper postoperative maintenance or poor rest. 1. Use of hormonal drugs: In order to have a successful transfer, chorionic gonadotropin and progesterone injections will be administered after the transfer. This can cause progesterone to stimulate the breasts and lead to a painful reaction. 2. Successful pregnancy: Pregnancy promotes a large increase in progesterone, which in turn stimulates the breasts and leads to a painful reaction. 3. Inadequate maintenance or poor rest: not getting good rest and maintenance after transplantation leads to adverse reactions. Chest pain after transplantation may also be due to other reasons, such as breast hyperplasia, etc. You should need to go to the hospital, active diagnosis and treatment, as well as good protection and adequate rest.