A pregnancy with a chocolate cyst generally has no effect on the fetus. Chocolate cysts generally refer to cysts that form when the lining of the uterus becomes ectopic to the ovaries and may have an effect on the ability to conceive, but if you are already pregnant, there is usually no effect. Chocolate cysts may cause abdominal pain or increased bleeding during menstruation, but after pregnancy, due to changes in hormone levels, menstruation will not occur again, so the effect of chocolate cysts is less; however, it is important to note that if the chocolate cysts are large, it is necessary to be careful not to exercise strenuously, to avoid rupture of the cysts or torsion of the tip. Regular checkups are needed throughout the pregnancy to observe the growth and development of the chocolate cysts, and if there is any abnormality, it is recommended to consult a doctor in time.