Brown spotting at 6 weeks pregnant

I had the smallest bit of pink spotting a couple days ago but last night and today I’ve had off and on brown spotting- especially after a BM. For those that have had miscarriages, did they start with brown spotting? I think mine started with pink/red but am not sure. My pregnancy tests have been getting darker until today’s which is the same and I had been peeing frequently although that slowed down. Not really any cramping, maybe a tiny bit like I’ve had all along. I know brown means old blood but I don’t really understand what it means beyond that.