early ovulation, long luteal phase...

Mandy • Endometriosis dx 2015. MC Sept 2016. 🌈 baby Grace 11/26/2017.
Hi ladies... Got a positive opk this cycle at cd9 this month. Typically have a 10-13 day luteal phase.
Am now at cd27 which would put me as 17dpo. Tested at 13dpo and bfn.
Sound promising, or is it just more likely I didn't actually ovulate cd10 after the positive opk?
Anyone had a similar experience?