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 five 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. There was some red. I also feel a little sick but only at night or at the thought of being pregnant. It is probably too soon to take a test. Was this AF or implantation bleeding?