OPK + then - then +. What does this mean?

Cortney • Hi! This is my first month TTC. Im 36 years old.
Hi, this is my first month TTC after being on the pill. I have been using a digital opk to determine my LH surge. On Thursday I got a positive smiley face. I tested again the next day on Friday and it was negative. I tested again today (Saturday) and it was positive again. Please help! Trying to figure out what this means. 

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors