No harm no foul at this stage. When a student teacher relationship is low in hours it is perfectly ok to say hey, I just don't feel right working with this person and would like to try another one. Later on when you have tried another one or more and selected one you can work with, beware of the mental pitfall of thinking the plateau you find yourself in is your instructor's fault. Chances are it is simply a learning plateau, and they tend to occur when the instructor raises the bar to send a student to a checkride and the student to wonders why previously they were doing so well and now they are so incompetent. That's your instructor trying to groom you for your checkride. Pony up some more effort, stick it out and push on to the finish. Get a second opinion if you like, but do not change instructors late in the training game.