Ovulation confusion. No CM? When to take OPK?

I’m on day 14 of my cycle. Day of my last period was December 28-1st Jan. Had no cervical mucus at all this cycle, seems dryer than usual. All my apps are saying this week has been my fertile window and apparently today is my ovulation day but I’ve taken 5 opk’s and have all come back negative? Boobs have been quite sore so maybe ovulation is on it’s way? Don’t want to keep wasting ovulation tests!! When’s the best time to take them?

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