Bbt dip and then rise...

Katy • Hairstylist. On month 13 of ttc #1 praying for our BFP!! ❤️
​so I had a temp dip yesterday and then it rose again this morning... Is this a good sign?! I took a test this morning and I got a bfn on a
​Wondfo test, but I'm only 10 dpo and my period isn't due till
​August 8th. What is everyone's thoughts? We're ttc #1 and this is our 5th month ??