Positive HPTs but negative at the doctors?

I have taken 5 HPTs on 5 different days last week and they've all been positive. My last period was sometime at the end of May.

I took a test last night (not photo'd) and it was positive. I went to the doctor today and she said the pee test was negative.

She took a blood test and will let me know... but I am freaked out and confused?! I have no idea what is happening. Am I pregnant or not?

FYI I had a D&C April 28th (almost 10 weeks ago) but my doctor said it was long enough ago that my hcg levels should have been at 0 by now.