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An OPK indicates an LH surge, which is linked to ovulation, but does not necessarily mean that you did ovulate (ovulation occurs 12-36 hours after your peak LH, generally speaking, but it's possible not to kick out an egg after a surge).
Your luteal phase (the period of time between ovulation and AF) should typically remain pretty constant from cycle to cycle. It's the follicular phase (days from AF to ovulation) that can be kind of wild sometimes.
Your luteal phase (the period of time between ovulation and AF) should typically remain pretty constant from cycle to cycle. It's the follicular phase (days from AF to ovulation) that can be kind of wild sometimes.