Can you have endometriosis without heavy bleeding?

Yes.

Heavy bleeding is just one of many signs or symptoms of endometriosis. Actually, many women with endometriosis have none of the usual symptoms and would never know it without an exploratory surgery (or if the doctor noticed it during caesarian delivery), because endometriosis doesn't appear on ultrasounds, blood tests, MRI, or XRay. For more info check out: http://www.womenanswers.org/womenshealth/womenanswers-org-a2-1136.html