Hi,
I googled this topic when I was 5 weeks pregnant and said to myself I would add my personal experience once little one arrived as I personally spent hours looking for any reassurance.
I started bleeding at 5 weeks and assumed the worst, called 111 etc and had no idea that there were other reasons I would be bleeding. It was spotting and then a gush of scarlet. I only called the doctor after finding a similar experience deep in Google. The Doctor said it wasn't necessarily bad news and seemed confused that I had assumed it. They also then got me in for an early scan the Monday after. I ended up going private just for nerves but it was implantation bleeding and my cervix was tightly closed, I then continued to bleed brown pretty much until 12 weeks. Everything was okay (apart from my anxiety was through the roof). And he was an absolute giant so I can only assume he was very aggressively settling in for a feast.
I have posted this really just so if you are in a similar situation to call the doctor and not assume the worst, hopefully it helps somebody call their GP for reassurance- I hope it is good news to whoever is reading this.