OPK is positive but no EWCM?

Wynter • Luckiest wife ever, being married to my best friend ❤️ Dog mommy to four 🐾
I haven't been taking any meds (nor do I regularly anyway) but I've been REALLY dry down there which is unusual for my fertile window. I've been trying to supplement with preseed. But my OPK was very clearly positive yesterday. What's the deal?