Let me answer your last question first. The possibility of pregnancy
due to intercourse immediately after the end of period is almost nil.
Since she has consumed I-pill within 3-4 hours of the unprotected sex, she is well protected from pregnancy due to this particular intercourse.
I-pill is a reliable post coital emergency contraceptive pill
when taken within 72 hours of the unprotected sex. These pills have some after effects:
1. Few days after the consumption of the pill, some bleeding may occur which is self limiting and does not require any medical attention.
2. The following period may get delayed by few days to a week's time. This is what has happened in her case.
However, since her periods are delayed rather for a longer period, for confirmation, she may perform pregnancy test on the overnight morning first urine sample. Alternatively, she may opt fore Beta hCG
test. This will confirm the pregnancy status.
If she is not pregnant (which is the high possibility), you may just wait for few days for appearance of her menses naturally. Alternatively, you may report to a Gynaecologist for some Progestational or Oestrogen+Progestational preparation for withdrawal bleeding.
I hope this helps you.
Dr. Nishikant Shrotri