heLP pls kill me

this month i took an emergency contraceptive.
but my bf and i have still been using the pull out method lol...
i've taken one before and it didn't mess up my period but blah.
my period was supposed to start on the 15th,
also on the 15th i got a nexplanon arm implant but i don't think it would've made me miss my period , infact my doctor said i should still get this period.
do you think all this progesterone could be making my period late ? or make it not come at all? idk ...
i reaaaaaaaLLLLY don't want to be pregnant