Ok the first picture is the article if you want to look it up. The second is the graphic showing an early LH rise and then a second that produces ovulation like you seem to experience some cycles. The third compares different methods of ovulation prediction to actual ovulation witnessed on ultrasound and LH peak. Notice the BBT method is not good at all for predicting the specific ovulation date. It’s a little confusing just looking at the pictures but the article explains it