OPK not turning positive
3 days ago, in the morning I took an OPK and it was very dark and VERY close to being positive, I took one again the afternoon and one again before I went to bed and they were both very negative. They have been clearly negative since and I'm wondering if I should count the darkest one as my positive and maybe I just missed my surge or whether I just didn't ovulate this month. I'm exclusively breastfeeding my 7 month DS and have had 2 cycles since he's been born so it's a little hard to pin point ovulation. My cycles are around 66 days on average since breastfeeding messes with my hormones so much. Today is CD 40. Thoughts? Here is the pic of the dark OPK!