WARNING: PICTURES! IMPLANTATION OR PERIOD?

I am 5 days late for my period. This morning I took a test which was negative. I then wiped & saw a streak of pinkish brown blood/discharge. I am very regular so this is not normal. Also, the first day is usually VERY heavy and bright red/brown blood. I put a tampon in and an hour later took it out and had only this light pink/brown, sticky discharge.. It's been 11 days since intercourse.  oes it look like implantation bleeding? :