Implantation bleeding or something else?

[XoAbBiExO]

Hi everyone I wonder if anyone can help this month me and my bf had unprotected sex a couple of times. My last normal period was on the 17 October this month my period was due the 14th November on the 12th November I had very very light pink spotting it gradually got a little bit heavier but not as heavy as my normal periods that normally last 7 days every month and are always on time the next day I had some dark / black spotting only when I wiped turned red for a very small time and then stopped completely until this evening when I am spotting light pink to light orangey colour during these 3 days I haven't even used half a pad. Can anyone help me. I have taken a pregnancy test with a very faint hardly can see it shadow of a line what could it be please help my last two pregnancies ended in miscarriage so I always panic when I bleed unless its my period. Thanks girlies X