Ovulation Tests?

I question whether your ovulation test has to be perfectly 10x darker than the test line, I mean there are several factors that you have to consider like the fact that you can't afford to test 3x a day to get that perfect line & cheap tests like these don't show sharp lines... I feel like I'm ovulating today (cramping/soreness) but my test isn't "perfect" 
​top picture is yesterday, bottom is today.