Period Starting or Implantation bleed?

So I had a miscarriage back in July and then in August had a D&C; so my first real period was in September, so my cycles have ranged from 35-39 days.. lasting about 7 Days. I was supposed to get my period 6 days from now, but I had someone light bleeding brown/light Red. I don’t take ovulation kits cause they stress me out but we are trying to get pregnant again. I supposedly ovulated around Nov 16th. Could this be implatatuin or just an irregular cycle and a sign I’m not ovulating? Anyone else have this happen to them?