Maybe a sign?

Hi so I was wondering for those of you with endometriosis what was some of your signs before you found out. Lately I’ve been feeling so tired like super tired if I just do something I’d run to bed. I’ve been having spotting every month for couple days my period is usually pretty heavy and had my last one 2018 . But for the spotting that I’m having sometimes its dark brown and sometimes it’s pretty red. I’m also having really bad cramps and back pain. I wake up tired and in pain every morning. The spotting and discharge is still going on. I’ve taken pregnancy tests and they all came back negative currently ttc. I stopped birth control 2017 and my period was coming every two to three months after that up until March 2018. Would love to hear some of your stories ;) also got ultrasound and blood work done earlier this year.