3rd cycle ttc no idea when I am ovulating..

Sophie

CD 17 no ewcm and no positive opk usually 31 to 32 day cycle, I am going to give up with them opk soon I have never had a positive! I just feel that I am already out cos I just don't know when I ovulate. I hate the unknown and then I can't even determine what dpo I am.. anyone else have the same issue? Any tips or comments would be really appreciated I am getting very emotional about it I know it's still early days.