Af is 6 days late, so Glow has started a new cycle

Af is 6 days late, so Glow has started a new cycle. It's kind of frustrating. My last 4 cycles I has peak opk around cd16 and af around 12dpo. This cycle I had peak opk on cd17 and af is 6 days late. My last bfn was yesterday. Any thoughts as to what is going on? Please help....I've posted several times in the last week with only 1 or 2 comments. Can I please get more feedback. I feel pretty lonely right now.