Postive test @ home Negative @ doctors

Samantha
Please tell me this has happened to someone before. I took 3 pregnancy tests at home on Saturday..2 Saturday and one yesterday. 2 were clearblue digital ones and all 3 of them said postive or "pregnant"..coincidentally I had an appointment for a physical today and I told the nurse I might be pregnant and she took a urine sample and it was NEGATIVE 😰. What is going on?? I'm beyond disappointed and sad, the doctor came in and told me the news. And when I told her I took 3 tests at home and they were all positive she was surprised so she took some blood to determine what is going on. She said she will have the results in a couple days, and I know those days are going to feel like years for me. Someone please talk to me. Why is this happening???