Implantation Question

Good evening Ladies.  I have a question about implantation bleeding and at this point I cannot figure out what is going on.  I have two children already but its been more than 7 years since me last pregnency.  A liitle background.  My last AF was 10/5, had sex on 10/19-10/21 with an aticipated O date on 10/19.  Took a test and got BFN on 10/29 (used an early detection test).  AF due 11/02.  Light spotting( only when wiping)  11/01, slight red blood on 11/02 (not even enough for a pad), pinkish spotting (only when wiping) 11/03 and now today nothing.  I have been having sore breasts, nausea, and am exhausted.  Really thought that AF had come but it has never been short like this.  I am just wondering if this could be implantation bleeding?  Anyone have any thoughts on this?  We are trying but not to the point were I am charting or anything.  Thanks!