When you are 20 years old and have endometriosis how hard is it to get pregnant? When is the best time to get pregnant if so?

Varies. Many women with endometriosis do not have difficulty conceiving. The best time to conceive is at the time of ovulation.
Depends . Most patients with endometriosis have no trouble getting pregnant at all. In a small number of endometriosis patients it can be an issue. Why the hurry at such a young age to get pregnant? Why not focus on your career plans and education first before starting a family?