My last period was December 23rd. It was really heavy which is normal but only lasted a few days. My boyfriend and I had sex January 2nd and I don't think anything went inside of me. However, I started bleeding dark brown on Januaray 11th and that continued for 7 days days. It was enough that I needed a pad throughout the day but it was no where near as heavy as my usual period. It also really only happened during the day. It is probably too soon to take a test. Was this AF or implantation bleeding?