pregnancy test question?

ka
Sooo if I have taken 7 pregnancy tests over the course of about 14 weeks and they have all came back negative is there a chance I could still be pregnant? 
I have used different brands and have followed the instructions exactly right. The doctors have also done a pregnancy test using my urine that came back negative. 
I'm on the pill and have been getting my period regularly and normal the last 4 months. 
I have just felt soo off lately , I have taken various urine samples to the lab and they keep showing high white blood cells. 
I have also had low abdominal pains everyday and constantly that feel similar to period pain for the last 14 weeks. I was refured to a urologist for further investigation. 
I had an MRI done last week and get the results tomorrow- wish me luck.