Is Pregnancy Possible If A Contraceptive Pill Is Missed?

i missed taking a birth control pill on saturday may 26 and didnt realize it until the thursday may 31 after. i took 2pills on the thursday when i realized it. and just continued taking the rest as instructed. i did have a period at the end of that pack. could there be a chance that i may be pregnant? if so when would be the soonest that a pregnancy test could defect if i were pregnant