does anyone have endometriosis?

Justine
I've now learned about endo, and I'm freaking out about the possibility of having it. 
Can anyone explain it more and their symptoms? 
My doctor has never brought it up or discussed it with me when I talked about TTC. 
I know I have regular periods right on the dot, mild cramping the first day of my period and then nothing until the next first day. 
Normal bleeding every month and a period lasting of only five days. 
I know it can be mistaken for IBS which I do have... 
can anyone ease my mind here?
Update: I did have pretty strong cramps in my lower back this last cycle. But I'm linking it to a possible early miscarriage though.