Endometriosis Support Group
Endometriosis is a common medical condition where the tissue lining the uterus is found outside of the uterus, typically affecting other organs in the pelvis. The condition can lead to serious health problems, primarily pain and infertility. A major symptom of endometriosis is pain, mostly in the lower abdomen, lower back, and pelvic area.
If you're concerned about time off work, chances are it's ok unless it starts hurting.
I would get the doctor to take it out for you as it will heal quicker once its taken out. Should not need to take anymore time off to get it removed.