I know how scary it can be when there is something going on with our children's health. Take a deep breath and be proactive about this. Does your local hospital have a nurse advice line or is there a number you can call to talk to a medical proffessional? I would start there, explain to them what the doctor told you and ask if they feel that this is important enough to get her in for more testing today. If nothing else, call your doctor's office back and tell them that you are really concerned about this and that you don't want to sit over a holiday weekend worrying about it. I've found that being honest about being anxious over a health issue whether with me or my child is not unusual and most people are very understanding about it. Try and get some more information and then give an update.