What is this?! 🤦🏼‍♀️

My fiancé and I are currently ttc. I use bbt and opks to track ovulation which happened on either CD 16 or 17. Period is due on the 10 or 11. I felt really wet down there and thought my period came but it was this super watery/stretchy CM. This is unusual for me. Opinions? If this a good sign for a BFP?