Sounds like implantation to me.
I had heavy spotting before I tested, I thought it was my period but it went away after 2 days. After that I was just getting strings of brownish coloured dishcharge when I wiped, that too seemed to die off and then last night I had some definite pink when I wiped. It looked like watered down pink blood. Today, nothing again.
Its driving me mental. I have a chromosome disorder which means I have a 50% chance of miscarrying any pregnancy, had a MC with my first pregnancy back in November, so I'm totally bricking it!!! X