I'm pretty sure it may be too early for a home pregnancy test to detect, a blood test may be the best idea this soon. But it is very possible she could be pregnant.
It is possible, if you want to be 100% sure it's probably better to get a blood test, I tried one of the take it home and pee on a stick tests and It showed negative, but when I did a blood test a week after it was positive. Good luck
She could be. I suggest using protection next time.
I should also add its been about 2 1/2 weeks since this "event"