Advance apologies for TMI...

I have (another) question about bleeding... I (finally) stopped bleeding about 4 weeks post delivery which was followed by another week and a bit of sporatic spotting. By about 3 days before the 6 week mark I had nothing at all (WOOHOO!). Then at 6 weeks 2 days I started getting spotting again. Except it is brown (at times almost black) and the qty varies. Is this normal??? I didn't mention it at my 6 week appt because it wasn't happening then!

TIA

MG