Period or implantation bleeding?

I had my period on the 29th of August as shown on the calender and ended on the 1st of September. My husband came to visit me in NC (we are in the process of moving) and of course we got intimate on the 30th after so many months being apart. Well my breast started hurting for that whole week and I thought maybe it was because of the rough play but I also started cramping one day then last night and today. When I went to use the restroom and wiped I had light pink discharge. Then later again I ended up having to wear a regular pad because I started light bleeding (a bit darker than before on coloring) with more cramps. So my question is what could cause the light bleeding 2 weeks after my last period?