LATE ON MY PERIOD

NORMAL PERIOD. WELL ITS NOT THAT ABNORMAL EITHER I JUST DONT GET IT AROUND THE SAME TIME EACH MONTH, ANYWAYS, MY BREAST FEEL TENDER(NOTHING OUT OF THIS WORLD) BUT THEY HURT. I VE BEEN URINATING ALOT LATELEY AND VERY TIRED, SOMETIMES EVEN NAUSEA. I WENT TO THE HOSPITAL A COUPLE OF DAYS AGO AND GOT A BLOOD TEST, IT WAS NEGATIVE BUT ALOT OF THE WOMEN IN MY FAMILY AND EVEN FRIENDS HAVE BEEN TELLING ME THAT THEY'VE DONE BLOOD TEST AND IT WOUDLNT COME OUT POSITIVE TILL THEY WERE ABOUT 6 WEEEKS. COULD I BE PREGNANT? WHAT ARE THE EARLIEST SYMPTOMS IN PREGNANCY?

SOMEONE PLEASE HELP...THANX