Ovulation Tests

I took the one on top first... Forgot to time it though, then two hours later took the bottom one timed it at exactly 8 mins. Then the bottom one darkened up after that time.... Could it be that I left it in my pee too long or not long enough, the sec test had a light line and a very faint sec line. What should I do? Does it matter what time of day I do it, and do I need to do it the same time every time...??? PLEASE HELP?