I am 26 year old and my girlfriend is 19 years old. This September her periods was due on 16th but still she has not got periods. We had sex using condom between ending of the august when her periods ended after 20 august. During one of the act while I was stroking condom tore and then I stop the act and masturbate in toilet. Can she be pregnant? I am worried if precum may have cause pregnancy Please help.