Thank you for your query.
The emergency contraceptive
or morning after pill is notorious for preponing or delaying your periods.
According to me, what happened was that mostly.
However, i am confused because once you say your period was on time, and then you say it came only a week after sex.
To check once more , take a pregnancy
test, it will only reassure you.
Though chances of a pregnancy are slim with double protection of birth control and morning after pill.
Be regular with your birth control as over hormonal
medications can mess up your cycles.