i did a HPT at 4 wks and got a def +. I went to the Drs at 4wks 2days as i am O-neg and had some slight spotting and wanted to know if i was to worry. He did a test and it was neg. He told me their tests do not detect levels until they are about 50hcg and often HPT's are much more sensitive and can detect levels as low as 15-20hcg. My first blood test too came back as inconclusive and i had a repeat one done 3 days later and it was pos. I know the waiting game sucks but i believe you are Pg and in your heart you sound like thats what you believe too. Well goodluck and let us know how you go on. HTH to ease your mind a bit.