Hi Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern...
First of all the bleeding your girlfriend had a week after intake of I pill should be
breakthrough bleeding. This bleeding occurs due to intake of I pill & is less in quantity & lasts for lesser days as compared to a period as you mentioned. Breakthrough bleeding means that I pill intake was successful in preventing pregnancy.
Now her next periods are delayed. Delay in periods is a common side-effect after intake of an
emergency contraceptive pill like I-pill. The delayed periods are due to effect of high dose of
levonorgestrel hormone in I pill which disrupts your normal
menstruation & causes delayed periods. Your periods may be delayed for 1-2 cycles.
An emergency contraceptive pill like I-pill prevents pregnancy by inhibiting
implantation of fertilized egg on to uterus. It is 95% successful if taken within 24 hours of intercourse. As you had taken the emergency contraceptive pill within an hour of sexual intercourse, pregnancy possibility should be less.
However, You are also advised a pregnancy test to rule-out even slightest chance of pregnancy
Don't worry she would be fine
Hope this information helps