I need some ovulation help here ladies

Nicole
So my doctor gave me Letrozole this month to take on cd 3-7. I started taking opk tests on cd 8. Today I am cd 9. It looked like I was close to ovulating already and then I took one today and there was barely a second line. Did I ovulate early due to Letrozole and miss it? I'm so confused. In the pic the top one is from yesterday and the bottom is from today. 

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