The participants in the autofill void trial group will be allowed to urinate at any time within the first 3 hours after surgery. The amount urinated will be recorded using a commode specimen collection measurer. The PVR will be measured using a bladder scanner. If the PVR is greater than 100 mL, the void trial will be considered "failed" and a Foley catheter will be replaced. We anticipate that most of these patients will void spontaneously within 2 hours of arrival to the PACU. At two hours post-operatively, any patient who cannot void or does not have the urge to void will have a bladder scan. If the patient has more than 300 cc in the bladder, she will be allowed 1 more hour to void. If she cannot, a Foley catheter will be placed and she will be considered to have failed the void trial. If the patient has less than 300 cc in the bladder, another 500 cc of crystalloid bolus will be given and we will await void for another hour. At 3 hours post-operatively, these patients will undergo another bladder scan. Those with greater than 300 cc of urine in the bladder will receive a Foley catheter. Those with less than 300 cc of urine in the bladder will have a backfill void trial by placing the remaining amount of fluid into the bladder for a total volume of 300 cc. The rest of the void trial will be completed as per normal backfill void trial protocol.