Ovulation test question, Please help lovelies :)

Olivia • 25 and TTC #2 :-)
Hiya :) So I've been taking ovulation test most days now. Well the last few have shown near enough no second line. But I've noticed the last two days, although not enough to be positive, the second line get more noticeable. Would you say your lines got darker progressively before a positive? I've also noticed a surge in clearish stringy discharge today also. Thank you :)