Freaking Out

My boyfriend and I had unprotected sex about three times this month. He never finished off inside me. I am now 5 days late, I have taken two pregnancy test and they were both negative. For the past four months, my periods have been black. I called a gynecologist but they can't see me for a month in a half. What should I do? I'm terrified! I'm 20 but I can't really talk to my parents because they're strict Catholics.