Worry wart

It's my first time tracking my ovulation with the opk testers and I havnt gotten close to a positive...I'm cycle day 20...the docs have always suspected I have endometriosis but never got it diagnosed through a laparoscopy. It's my 3rd month ttc and I have a feeling I'm going to be in it for the long haul...I'm scared cos I know it's hard for y'all ladies that have been trying for a long time...