Good idea - Yahoo shows Thursday low 35.67 at 9:32am, but it was a huge wickless green candle (looking at 1 minute interval chart), with extremely low volume. The candle ended at well over stop loss at 35.81 (also the candle's high). So actual shares traded at below my stop loss likely even much smaller again than even the low volume on that candle would suggest.
Look at time & sales, not charts.