Totally confused newbie!!!

So me and hubby have literally only been trying for two weeks so We’re very new to this stuff and very confused! I’ve taken an ovulation test every day of my predicted fertile period (according to all 3 period tracking apps I have!) and it seems the closer I’m getting to ovulation day the fainter the second line is becoming. Today, what is supposed to be one of my peak times the line is barely visable (in the photo they are going in order of when I took them, top one being the oldest test. Bottom is todays) feel like I’m about to go crazy waiting for a dark line!!!

Please help!