Not sure what to think... 2 blood tests, and urine

I don't know that I have ever posted on ivillage before, but I have had this name for YEARS on here, so i figured this would be a good place to start.

I went to the ER today because of some sinus infection or something that I have had going on for 6 weeks now. The pain was just too extreme now. They decided to do a CT scan of my head. Only to not do it because they ran 2 pregnancy test (blood) and they were positive. Just barley positive, but positive all the same.

I was told years ago I can't conceive. I am 37. My son is 17. I am not with this potential father either.

Tonight I took a urine test and there was 2 lines, but one was very faint.

Do I assume 2 positive blood tests and a possible positive faint urine test is a sign I am pregnant? Is it possible they are all wrong?

I am so confussed on what to think...