Im 21years old... well i had sex for the very first time n it was an unprotected one. Im very much worried. If u could kindly help me out.

I had my period last month around 2nd of june. n my due is around 4/5th july. i had sex on 3rd.
i did take ipill within 7hours of sex.
But my concern is i have seen everywhere its written vaginal bleeding takes place....its almost 3 days today n i had no vaginal bleeding, rather im a bit sore n my vagina itches.Im really tensed... help me out.