Unwanted Pregnancy. Unwanted pregnancy?

Hello, Doctor. I'm 18 and my girlfriend is 17, and we're both students. We are aware of the risks of unprotected sexual activity, and have both stayed virgins. However, on October 25th, 26th and 27th, we engaged in foreplay (no genital contact). Her period before that started on October 20th, ending on October 24th. Her next period is late (Her cycle is usually 32 days). She hasn't shown early pregnancy symptoms. A home pregnancy test (Piramal Healthcare I-Can) on the 30th this month turned up negative. She didn't take the test with her morning urine, but the sample she used was concentrated. I did not ejaculate on any of the three occasions, and took care not to get any pre-ejaculate near her. My questions are: 1. Is it possible that she is pregnant? 2. If it is, then how do we handle such an unwanted pregnancy? I am ready to inform her mother and take responsibility for my rash actions if the need arises. I also know that she had egg white cervical mucous from 8th to 13th November.