CD1 or Cd2 to start made a difference?

Just a question out of curiosity though I know it depends on the stimulation protocol. My protocol for my egg retrieval says I should start day 1-2, last time same protocol I started day 1. I’m just wondering if anyone has a 2 day range and found there was an difference whether you started CD1 or CD2. I was told CD3 is too late.

My protocol is rekovelle and then rekovelle+ganirelix then ovitrelle to trigger following my normal cycle.