Short Luteal Phase???

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Hey ladies-

I’m wondering if anyone has any information on what the normal length of the luteal phase (between ovulation & AF) should be? Some articles say 10 days is normal but anything below 10 is not. I’ve also read that anything below 12 days is considered a “short” luteal phase.

I’m really curious and would love to hear any information you have.

I looked into it because mine seems to be getting shorter averaging 11 days but this month was only 10 days and last month 9.

Thanks for any info!