Welcome here on healthcaremagic dot com a site for solving your health problem online by qualified healthcare professional.
I am very much concerned with your problem and certainly will guide you how to get rid of these.
In my view
You did sex at highly fertile period of your cycle.
But your taking pill is within time.
So by your history this can’t be said that it was not working.
I suggest you to
Wait and see with no tension as you can’t do anything more than to wait for12 days after your expected date of period.
If no period by then than do pregnancy
test of urine and follow the result.
Dr Agarwal V L