Don't take any pills,instead wait for your due date,as in case u are
pregnant it's easier to get rid of it rather than taking ipills now just for a withdrawal bleeding which actually misleads and delays periods even if u are not pregnant.
Most likely u would not be pregnant as u did a sexual contact in safe period,unless you are very fertile or luck is not on your side.
Next Steps
wait patiently
Health Tips
stay stress free as stress whether Physical or mental too delays periods due to harmonal changes caused.