Little confused

Chelsea • Happily married. Have 2 amazing sons and ttc baby #3.
Was supposed to start AF on Tuesday. Haven't got it yet but had a little very light pink discharge when I wiped on weds then nothing after that.. Today when I wiped had a small clot looking brown discharge then nothing after that. 
​I tested last weekend was negative twice. 
​This is my first month off the birth control pill so I was thinking it could be my body that's all messed up but it's 4 days already.  
Could there be a chance I'm pregnant?