pregnant or not

Ok I really need some advice a couple of weeks ago I got up here because I didn't have a period. Well it's been 74 days since my last period Wednesday  I had light pink and brown spotting all day but last night it stopped.  The day before that I was cramping and it was just a really pale pink. I don't know what to do or think when I went to the doctor last time I was told that I would only be 3 weeks but my urine test was negative and they had to test my blood twice that was last month I haven't been back because they couldn't find anything wrong. I'm starting to get frustrated they are treating me like I'm pregnant but I don't want to gets my hopes up and be disappointed