Day 39 of my cycle , and no sign of a period.

Hi everyone,
  So I have this gigantic fear that I will never be able to conceive, my partner and I are ttc, but my tests are negative every time. I'm gaining appetite, nipples are sore, some weird "cramp like " pains in my abdomen-I have endometriosis, so this is not unusual, BUT feel different than the now occasional pain I feel due to the condition. It's not the same pain/discomfort. I don't want to jump the gun because I'm trying to keep my patience and stress levels down. So I haven't set up an appointment. But I have been off BC Nuva ring for almost 2 years when I was diagnosed with endometriosis. Which has finally allowed my cycle to be somewhat normal compared to the multiple months I would wait at times to get a period. But now, I'm beginning to worry again. 
Has anyone else experienced this? It seems that the doctors don't help much and don't want to deal with me. Very concerned and trying to to be.  Thanks for all help or recommendations in advance!