What is the difference between endometriosis, pcos, and ttc?

All different. Endometriosis is endometrial tissue growing outside the uterus. Pcos is poly cystic ovaries. Ttc is usually the abbreviation for "trying to conceive".
TTC = time 2 conceiv. Endometriosis is a disease in which portions of uterine lining attach to sires outside the uterus (abdominal wall, ovary); there are many definitions of pcos: i got by a syndrome in which a women has irregular menses and signs of elevated male hormone (elevated testosterone, increased plucking) they are separate pathologic processes but can contribute to female infertility to varying degrees.