Stressing out!

Today I went to my dr for a urine test to verify my pregnancy and the line was so faint that he ordered blood... Which immediately had me assume the worst
Then tonight I took another pregnancy test just bc I couldn't stop thinking about it... 
3 days ago it read 1-2 weeks... I want to relax about this but I can't! Could my dr office test have been diluted? Anyone experience conflicting resulting and know why?