Period?implantation???

JTJKH
As glow predicted on Thursday I started spotting brown blood like I would be starting my period I had cervical mucous with it brown tinted so I inserted a soft cup later that day when I removed it there was hardly any fluid there just more brown cm I wore a tampon overnight when I removed this morning it had maybe 3 spots of brown tint on it 
I haven't had anything since then usually my periods are very heavy and bright red blood i did have the usual cramps and still am having some also had headaches like I usually get when starting and very sore boobs we have been Ttc for a year 
I don't know what to think of this I have taken two pregnancy tests with BFN 
Thoughts?