I was endorsed a 3 y/o male with bronchitis. We did the endorsement on the station. He had a skin test that needs to be checked. So after endorsement, I immediately went went to his room after and checked the skin test (I know the doctors should do this but that's how we do it in the hospital). I noticed that the IVF was already consumed! H was hooked with D5IMB 500cc x 46-47mgtts/min. I stoped the infusion and called the resident on duty to have an IVF to follow. He had not assessed the patient when he came up since I haven't told him what had happened. I got lost and I didn't know what should I do. I hooked the bag, maintained it on KVO and observed the patient for signs of circulatory overload. A few minutes later, the patient urinated a lot, which might be the way the body compensated for the fluid that had been taken in. I called the resident again, to have him checked. Thankfully, he said the patient was alright, as he is not dsypneic or tachycardic. I endorsed what had happened the next shift. Unluckily, I didn't write what had transpired that day, nor the level of IVF when I had received it. I asked the mother if someone did regulate the IV when they were still in the ER and said that they were not attended anymore after inserting the catheter.Now, the pedia was looking for me, and she is fumed. I wonder if I should tell the nurse supervisor first or go and tell the pediatrician what had happened? I am really scared, I'm new at work and I don't know what should I do.