Glow changing cycle?

Sarah-Jane • TTC 16 months💏We did it🤰🏽Sophie born 10/7/18💕
Bit of a long one but....After logging for 8 months and 6 out of the 8 I logged a positive OPK on CD13&14 and put my AF day as starting day 27, i did start bleeding on this day but 2 cycles were 26 and 1 on 28. Glow has put my AF to start on day 30 (which hasn't happened before) 
If I had a positive on Monday 5th and felt O pains that night and Tuesday would I not be due 14 days after that not 17 as my luetal phase is always 14 😫🤔

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