Spotting and period

Kelle • 24 and proud mom to 1 amazing girl; expecting end of May ❤️?
Do you count the one or two days your kinda spotting/getting your period in the period box? 
​Have a little pinkish blood yesterday and today but not enough to do anything about it, thinking my period is coming tomorrow(due today) or later today.  
​Is today day 1 of period or is yesterday?