Pink in discharge

Hi all,

I am around 5 and a half- 6 weeks pregnant. Last week, I experienced a very small amount of pink in my discharge and 1 week later (last night) had the same thing. Could this still be implantation bleeding? Or has anyone else experienced this? 

I have had two miscarriages before this pregnancy and unfortunately they started this way. I have a scan tomorrow but I just wondered if anyone else had gone through this before.

last week I also had my bloods done and my HCG levels were 850. Is this low?

Many thanks!