24 weeks spotting

Alright so yesterday morning I woke up and was cramping bad. Called my doctor she had me come in, they did a stress test and baby is fine. While I was there, there was blood in my urine. My doctor had to leave for a delivery so I had to be seen by the nurse practitioner (who was super rude) Then they checked my cervix and make sure there wasn’t any kind of fluid. I left with no answers. Cramps never stopped. Woke up today they are worse, there’s still blood in my urine. And so I called the doctor again they said my tests were negative and basically I was making up the blood in my urine. I don’t know what to do, I’m in pain and I can barely get out of bed. I have an appointment Friday. I just want to know what’s going on. From experience anyone know what could cause this? And what should I do?