can you ovulate without pos opk?

So, I have had tons of ovulation symptoms this last couple of days from spotting to sore breasts to emotions. I'm just curious to know the answer or if it's just a weird cycle. I've been testing opk since day 9 and it's now day 13. opk got really close on day 12 but maybe I missed the perfect timeframe. in the past I've not had positive opk til day 14 or so.

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