Jacuzzi Tub Rationale

I admitted a patient with ruptured membranes, first baby, early labor in the middle of the night one night. I wasn't heading in yet to do labor support as the woman was very early in the labor still...but she was laboring. I left orders for expectant management and to call me when she was a little further along. Apparently the nurse didn't want the woman to get in the tub until I arrived because the head was very low in her pelvis. That's the best rationale I have ever heard to not allow a patient to get a tub. Really? Really.