I had the same kind of spotting as you, it could be implantation bleeding, I took a HPT nd it came out positive, although I still have a brown discharge.
I'm finding that women who begin TTC have this happen to them very often. More than likely it's the stress of TTC! I once had a 2 week late period. I wasn't pregnant, I didn't miscarry, etc., etc. It was just extremely late and I swore up and down I was pregnant.
I would assume the spotting you had was your period. A period is defined by bleeding and shedding of the uterine lining. It is also defined as occuring 2 weeks after ovulation. It does not matter how light, dark, heavy, clotty, spotty it is, even if it isn't the norm for you.