4 days of pill- what will happen to my period

Narz • 30s ttc#1 after a miscarriage
I started the oral contraceptive pill this month just to avoid my period for the month. I only managed to take it for four days because of the side-effects. I'm just wondering if this will change the expected due date of my period? Hopefully it has delayed it by a few days, has anyone else done this?