Confirmation of pregnancy through urine pregnancy test - Online Doctor Chats

Doctor :   hi
Doctor :   how can i help you?
User :   hello
User :   My last period was Jan. 14 2009, I took an at home pregnancy test and it came back negative so I went to a clinic and they took a pee sample from me and again it came back negative. I started spotting to day but it was a dark brown color. Is it possible that I am pregnant? Is a blood sample better then a pee sample?
Doctor :   ok
Doctor :   if you were pregnant your urine sample would detect it earliest
Doctor :   since it has come negative its highly unlikely that you are pregnant
User :   ive never been late before
User :   its been 14 days
Doctor :   did you have any sexual encounter without protection in recent days?
User :   yes
User :   Im married so almost everyday
Doctor :   are you stressed out for any reason?
User :   no
User :   ive been getting really bad headaches for about a week. and i have been sleeping alot more then usual
Doctor :   ok it may be that urine test you took was too early before 6 days.. so you can try the test again and consult your gyneacologist for the same