Brown discharge...what could it be?

I last got my period on either February 20th or February 21st. So I was expecting my period around next week. I've researched it and there's a possibility of it being implantation bleeding. However, I am almost certain I'm not pregnant. I've never had sex before. On the 9th of March however, me and my boyfriend fooled around (I gave him a handjob and he had fingered me) but we are both pretty sure there wasn't any *** on his fingers. What could this brown discharge mean? I'm not pregnant am I? My boobs do hurt a little but they're always like that and I think I'm just worrying myself too much. Do you think I'll be getting my period soon?

?2013-03-19T12:25:33Z

Old blood from period.
If you're scared, go to your GP. (doctor)

LadyMerton2013-03-19T13:41:13Z

old blood- ALL blood turns brown when old/dried- science fact