Apex: Midsystolic Click
Clicks are high frequency sounds which occur in systole, either mid, early or late. They occur at least .14 seconds after the first sound. The most common cause of a click is mitral valve prolapse.
The clicks of mitral origin are best heard at the apex, or toward the llsb. The click will move closer to the first sound when volume to the ventricle is reduced, as occurs in standing or the valsalva maneuver. The click will move farther from the first sound when ventricular volume is increased, as in squatting or bradycardia.
The sound you heard is a typical midsystolic click of a normal twenty year-old female.