Ok me and my daughter father had unprotected sex a few time doing earlier this month. My last period was on September 23. When I was at work my lower back was extremely hurting , including at that time I had to use the bathroom. As I was wiping I seen a light pink bleeding no smell. Than the following day I was spotting again, than when I wiped again I was spotting again with a little brown slime. My period is due the next week, could it be implantation bleeding?