Hello mam in my opinion there are negligible chances of pregnancy because if taken daily on same time pills have very low pregnancy rate
Together with protection and pull out method it declines further. And delay of periods can be due to several reasons like stress
, new exercise schedule or altered eating habits.
But still do a urine pregnancy test which if negative wait for periods and if you don't get them in another week Visit your gynecologist. Wish you all the best and take care.