on birth control, symptom help

Lisa • married, current fur mom, and pregnant ❤

hi I wasnt sure where to put this, I swear I'm not symptoms spotting. I am on birth control, but two days ago I starting having periodic feeling of a pulling/pinching sensation on my belly button, then today I find a brown mucous discharge in my undergarments.

can someone give me some possibilities, also should I stop taking the birth control? I have 6 days left until my period, thank you!!