Pregnant?

Iv messed around with my bf this month we did not have sex but have done other stuff such as fingerings etc. ... I noticed brown blood in my underware this morning after he fingered me and used a hair brush handle to get me off... i do not start my period for at least 5 more days... could I be spotting or is the bleeding from the hair brush handle being used....I took a test just now and it was negative but idk if it's to soon or not to tell...