Hi there, so I have taken plan b twice last week with just two days apart. My ovulation day is on October 25th and been using condoms as protection. Yesterday, October 30th, I noticed some spotting only once when I went to the washroom. It was when I used a tissue to wipe myself. It was red. Didn't experience another. I've had breast soreness for about two days now. I've also been having cramps. My expected period is on November 8th. How likely is it that it's from the plan b and not an implantation bleeding?