Keep drinking lots of fluids and finish your antibotics. Did they say were the kidney stone was-high up by the kidney or down low by the pelvis. If you do not have anymore pain, than most likely the stone passed without you knowing it, however, typically you would know because it hurts when you pass it and you typically would see some blood. The other possible case of your not having anymore pain is that the stone may have popped back into your kidney. The pain that you experience is the stone blocking the tube that runs from your kidney to your bladder.
Make a follow-up appointment with your primary care doctor. This appointment should be shortly after you finish your antibotics.