Positive looking opk at cycle day 36. Is it really positive or are my eyes going crazy?

Alex • DD 7.5.2012 expecting identical twins 4.5.2017
opk at cycle day 36. Is it really positive or are my eyes going crazy?" />
So, I thought I ovulated on the 4th of June but this confuses me. I've gotten bfn's on Wondfo tests this entire time. Why would I get this(looks positive to me) if I'm not pregnant and I've ovulated earlier in the month? Please answer in comments. I'm on cycle day 36 and I take metformin. This has only happened once before, when I was pregnant with my daughter. However, I tested with first response(bfp) instead.

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