OPK Tests

Sammi • 25yrs old, Mumma of 1 beautiful daughter (3) married for 4yrs & just got my BFP after 1.4yrs TTC #2 ❤️
So I know when you have the LH surge the line is supposed to be as dark or darker than the control line BUT my second line is barely visible.. Does it gradually get darker as you get closer to your ovulation day or is it just dark out of the blue??
​Thanks in advance :)