Hi, So For The Past Couple Weeks I've Had Random

Hi, so for the past couple weeks I've had random nausea but its gotten worse in the past week. I've been really lightheaded and sometimes dizzy. I took my blood pressure today and it was 90/45. I drank a few beers about 9 days ago and it made me really sick. I'm 20 years old, 125 lbs and I'm 5' 6. Ive had unprotected sex for months now and haven't been on birth control for about two months but I didn't have normal periods because I was diagnosed with endometriosis in February of this year. Is there a chance I'm pregnant?