delays?

can my period be delayed by just starting to have sex? i mean i know the obvious, being pregnant, but its unlikely, (we used the pull out method I KNOW ITS RISKY YOU DONT HAVE TO MENTION IT he pulled out wayyyy before hand) although im still stressed about it. If im stressed about it would that effect it too? im late by three days now. please dont comment bashing me and telling me im pregnant, this will not help.