Period or Implantation bleeding?? ((TMI PICTURE))

Ok so I forgot to take my pill and took it an hour before I had sex and this is only my second week of ever being on it. That was the 11th, and the 16th (exactly 5 days after) I spotted a pink-brownish-clear blood (see picture) that is so distinct all I need is a pantyliner. Today's the 20th and the past 2 days it's been an off and on light brown. Could this be implantation bleeding? My AF wasn't due until the 21st and this past cycle was only 20 days. Could I be pregnant?