My last three periods have been 9/3, 10/1, and 10/31. On 11/5, I had condom protected sex (6th day of cycle), with no notable breakages or slippages. However, I still felt anxious, so I took Plan B 6-8 hours after sex. I also started Seasonique that day. Fast forward to 9 days later (11/14), and I woke up with some bright red spotting that went away quickly; also my breasts have been sensitive. Today (11/15) I had some brown/pink spotting as well, and my breasts continue to hurt. How likely was I to have gotten pregnant from sex on the 6th day of my cycle, using condoms and plan B? Does the spotting sound like implantation bleeding? Please help!