7 days Late but still a negative

May
So I'm 7 days late but so much has been happening last Monday went to the ER for pain. They informed me I had Cyst that Ruptured within itself. But they did a urine test then and it was negative. I'm wanting to be pregnant but scared because not sure why the urine test last Monday and today came back negative. My husband and I said we will wait for a week and if no period by Thursday I will request a blood test.