Hello Lovelies :)
I'm new here! In the process of TTC. 
I've been using an OPK (Proov to be exact). My cycle is 31 days, menstruate for 10. I believe I have endo but trying to get help is proving difficult. I'm m trying to determine when I ovulate, yesterday I had mild cramping on the left side, and pinkish EGCM, I also had a headache. Yesterday was CD 16! What's confusing me is that I had the signs of ovulation but the OPK tests have been negative since CD 14. Any insights or help would be so appreciated!
Thank you 
Sincerely,
Kira