Information about pregnancy

Patient: Me and my girlfriend were touching , but there was no ejaculation , but we are not sure if she touch her vagina after touching my penis . She is still virgin. This was 2 or 3 days before her menstruation and after 2 or 3 days she have her period ( menstruation on time) , her menstruation was on time and was 5 days long . Because we were scared after 6-7 days we take pregnancy test and it was negative , so i like to know is it possible to be pregnant ?