Unwanted Pregnancy. Do we do if she is?

Hello, Doctor. I'm 18, my girlfriend is 17. She had her last period on October 20th, till Oct 24th (her cycle is ~32 days). On Oct 25th, 26th and 27th we engaged in cunnilingus (oral sex) and clothed dry humping. I did not ejaculate on any of the occasions and we took precautions not to get pre-ejaculate anywhere near her (my hands were washed and dried 20-30 minutes before the act on every occasion). She had egg white cervical mucous from 8th to 13th November. Her period is still due. She hasn't shown early pregnancy symptoms (implantation spotting, nausea, food aversions, tender breasts) but she has been eating a lot and frequently urinating lately. A home pregnancy test (I-Can, Piramal Healthcare) on Nov 30th turned up negative. However, she didn't perform the test with her morning urine. She did it in the evening, but her sample was concentrated. Could she be pregnant? And what do we do if she is? I am ready to inform her mother and take responsibility. But we are both virgins!