Starting Date on Birth Control

I'm back on the pill, Nora-Be specifically, and do not know when I should take the first one. I started my period yesterday, it says in the leaflet to take it the first day of your period and obviously I missed that. So now I don't know if I should take it tomorrow morning, the third day of my period, or wait until Sunday the first of June. Does it even really matter? I know the most important part is to take the pill every single day  around the same time for it to be as effective as it can be.