4 high fertility days on OPK! What does it mean??

K
Im using clearblue advanced digital opk. It's my 3rd cycle using it. The past couple of months, I've only had 2 "high fertility" days or flashing smiley faces then I peaked the 3rd day (solid smiley face). This month... Today's my 4th "high fertility" day!! Is this normal??? I've been drinking red raspberry leaf tea since CD1. Could this be related??? Has anyone experienced this before????