Confused on being pregnant need advice

Ok to start off my last period was june 10th. Af should have showed up July 10th. I'm about 34 days late. I took 4 test in the month of july. 3 negatives and 1 didn't work at all. On August 2nd I went to the doctor for depression and before they would prescribe anything they did a urine pregnancy test it was positive. Well today august 5th just 3 days later I went to the bathroom around 3:30 pm and when I wiped the toilet paper was pink and I got so scared because I have had a miscarriage in the past that I went to the ER because my obgyn wasn't answering. They did a urine test and blood work and they showed negative. The doctor told me that I wasn't pregnant and never was and to follow up with my obgyn. What do you all think could I be pregnant or is there no chance? Thanks for advice in advance.