silly question

Christina
This is my first time trying to conceive and I'm tracking my period.  This time I started Tuesday with some very light spotting.   I usually count my first day of my period as the day it is my "normal heavy" not a spitting day.  It's now Thursday and I'm still slightly spotting.  Wondering should I track my period starting Tuesday the spotting day or wait and say the first day of my period is the day it's heavier?? Thanks for your help.  I'm sure it changes the schedule of my ovulation days so I wanted to make sure.