Do not want to be pregnant

Hi I am 16 years old and very religious so one of the reasons I am choosing not to have intercourse is this reason however I am so afraid when we were fooling around his semen got in me but he did not go in me but I am afraid of what did and it happened on March 20th and I got my period that night and I am sure it was my period and it lasted and now it is April 21st and I still have not gotten my period and I am so scared I do not know if I am PREGGO ah help