Could i be... want your opinions.. please?

me and my bf bd on august 16... on september 5 i had some spotting for like 3 days... it was light... nothing close to my normal periods... then on october 11 i had some more spotting that was 2 days and very light.. now i was supposed to start sometime between the 5 and 11 but af hasnt shown up yet...i tested once in september but it was negative... ive had pretty much all of the symptoms... but now the nausea has started to deminish... if i dont start this month im gonna go to the doctor... but i was just wondering if you think i could be pregnant...???