There's always a chance of pregnancy.
It's unlikely however from your description. The i-pill is very effective within 72 hours. It is not intended however to provide any "future" protection so having sex on the 7th was a risk.
The period on the 12th is a common side effect. She can have an early or late period, heavier or lighter than normal.
She can take a home pregnancy test if she wants, at least 2 weeks after having sex.
Hope it helps.