Is Pregnancy Possible After Taking I-pill Followed By Sex?

Hi.. I had unprotected sex with my friend. But I did not ejaculate. Since this was the first time I had sex, I removed it soon. Even then, she ve taken ipill at 22nd hour. Her period started on feb 3 n v had sex on feb 16th. My question is will she become pregnant? And how do I know tat ipill is workin? We are so much tensed with this. Plz help us