Brown discharge.....

I am late on my period by 3 days but have had brown discharge for two days. I have no symptoms of period at all which i always have bad cramps since i was 13! Its only when i wipe... can i be pregnant? Took pregnancy test two days ago and came back negative and yesterday morning negative. Ive read so many stories about this being normal... just really hope its true and my hgc levels arent high enough to show