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Period or implantation?

Is it normal to go from a 28-30 day cycle to a 23? Also, just discovered Glows predictions for my ovulation is inaccurate. I’ve tested everyday since the 26th and they’ve all been negative. So I think I ovulated two days after my period because I had a lot of CM. When I put my OPKS in the Glow predictor, it messed with my period dates. So I don’t even know what to think anymore.