Fingers crossed that everything will be okay..

I went to the hospital last night due to heavy bleeding and severe cramps (way worse than AF, I was in tears). They did a urine pregnancy test (negative) then did a beta qualitive test which came back borderline positive, then did a beta quantitative test that showed an hcg level of over a 2. They told me I was 2 1/2 - 3 weeks pregnant and diagnosed a possible threatened abortion. I've been researching and read that its considered negative if a level is below 5 :( but if that was the case, why would the doctor tell me I'm pregnant if I'm not? I have an appt on Tuesday to check my hcg levels again. Hopefully they rise like they should.