Not sure really. I always used to get spotting from O until AF (daily), but that stopped when I came off the pill. Didn't have any spotting then until a couple of weeks leading up to mc. After mc I've had spotting sporadically, but usually just leading up to AF.
However, I had some spotting on Sunday, which was before O for me too and I was a bit confused! Mine was pink though, not brown, and barely lasted any time at all. The only info I could find was that sometimes you can bleed a little bit when the follicle bursts to release the egg. Think it was too early for me though, so am just putting it down to 'one of those things'.
Good luck with everything
