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OPK help! New to tracking, Dr. suggested

I’m on a cycle of 28-32 days. My dr. told me to start tracking my ovulation from day 12. I started day 10 just to see. Today when I scanned my OPK it said positive. But then it changed my fertile window by 5 days and now I ovulate tomorrow or Sunday instead of Monday. Hubby and I only BD Monday, but plan on BD’ing all weekend. Thoughts on these OPKs please!