Advice on bloody poop...

My little started to have a little blood in her poop night before last. Woke up the next morning still there with dark brown mucus. Took her to the doctor they said it was most likely a lower gi bleed it should fix itself if not take her back in a week. Both poops today has has more blood and she's thrown up what looks like everything she's eaten... should I take her to the er? Should I keep calling the pediatrician? Should I just wait the week out?