Please help

My last period was December 30 THEN..i was spotting little brown for a day or 2 on January 31st no symptoms. no period since December 30 ( I'm irregular) and I took a pregnancy test February 8th and also today as well and it's negative my ob told me to wait 2 more weeks then test again what do you think please state ur opinions!!! (Im 6-12 days late)!