NERVOUS

I had unprotected sex not during my fertile window on March 3rd and we did not even finish or were fully erect. this app says my period should be coming on the 12 or sometime during then should i worry, If it doesn’t come then? Should i not start to worry until the month of March is up? Does your period usually fall on the 3rd week of the month of the 4th ? I have no had any pms symptoms like i usually get sore boobs and its the 9th is that a sign im preggo?