OPK negatives?

Ly
This is my first month of using opk tests and I feel like I'm doing it wrong. Did I ovulate? This is my first time of really TTC. I have a baby but she was a surprise. I'm still breastfeeding so I don't know if that affects these tests?
My last period was 3/8 and my cycle is usually 30 days. 
Help?

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