why period are starting late?plzzz tel me is there any chance of pregnant.

hiiiii i am pranaya i am degree final year.i have one question to want know.me and my boyfriend met.he fingered me in my vagina not fully bt little bit not fully inside.he inserted half inch of upper finger line.now my problem is 2day is the my period should start but did not started is there any chances to become by doing this.i am scared so much wat to do nw.plz let me know about this.his finger is also dry.plzzzzzzz mam tell me wat is the problem now plzzzzzzzzzzzzzzzzzzzzzzzz