Wet patch but no AF???

AF is due today (as per GLOW-always start when GLOW predicts so pretty accurate) so felt wet down there (almost like I peed myself a little) went to the bathroom as I thought that AF arrived but instead I found no blood only a wet patch and when I wiped nothing just more wetness.

Any idea??

I normally spot a little for a few hours then full on period when AF comes

I'm on cycle day 29

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