Can implantation spotting or bleeding last more than a week ?

im a bit concerned a might be pregnant or that something else entirely could be wrong but i cant get into any doctors n my city for another week. a week before my period was due a began noticing what appeared to be brown coloured discharge when i used the bathroom, ive had it everyday since its never heavy only a a bit. the only other thing ive noticed is my vagina is pretty sensitive inside. i started my sugar pills 4 days ago now so my period usually shows up yesterday or today but besides the brown discharge it hasnt come. i seen a doctor about this 6 days ago, its been 8 since the discharge began, and he wasnt alarmed and said it could have been birth control related but i am waiting for a urine test back aswell. ive never had anything like this happen before and was wondering if anyone has heard of inplanation bleeding lasting longer than a few days

i took a pregnancy test and it was negative so im not sure whats going on and i keep trting to see doctors but theyre booked out, coukd it be an infection?