Day 3 testing

Stephanie • Sept 4/19, May 14/20 👼 👼

Okay so I'm pretty sure I messed up 😬🤦‍♀️

I started my period mid day yesterday, and I had it in my head that the doctor told me to go day 2 but now that I'm looking into it's day 3.. my periods are pretty heavy but only 4 days. My flow is heavy today but is this day 3 or 2? Do I count yesterday because it was lighter and not a full day?? Someone please help 😥