Please help!!! Any advice!!

Crystal
Can anyone tell me why the 3rd sticks second line is so much lighter than the first two? My last pill of Clomid was on Monday! My <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> says today is my most fertile day but still no happy face on my OPKs :-( I'm worried I'm not going to ovulate on Clomid. I hate this waiting game