Whats day 1 of my period?

Sarahh

Ladies i need to do blood tests on 'day 2-4' of my Period. (Prefferably on Day 2 Dr said)

I started properly today after 4PM. Do i count this as day 1 or tomorrow as day 1?

When i was doing <a href="https://glowing.com/glow-fertility-program">IVF</a> day 1 was the next day if you started after 4pm. But not sure