Aiks, you can expect some withdrawal bleeding about a week after taking iPill. It is not menstruation but bleeding because of the hormones from the iPill leaving your system. Your next real menstruation after that may be unpredictable and if it does not arrive within 7 days of the expected date, you should do a pregnancy test.
You say that you did not have intercourse. The chances of you getting pregnant is thus very very very very small unless you two did something really stupid.
Take care!