Went to the er because I had a bad migraine spell and was dydrated. I told the nurse I had at least 3 bottle of water before I went to the er would that effect a urine test and she said no. So she took a urine test came back negative. Then she asks me how late I was. That day I was 5 days late she said well its too soon try again when you're a week late..... Has this ever happened to anyone?