Take it easy la. I tried over half yr with standard chart but failed. Then I use Ovaluation Predictor and bingo within 3m. Buy from Watsons/Manning, 1 pack consist of 5 pcs. Put in urine flow (same as Pregnancy Test) every morning. Start from M+10 days til M+15 day. If positive, then dodo la. Relax & easier to bingo arma...