Thanks for using HCM.
Generally in a 28 day long cycle ovulation (ovum formation in your ovary) occurs near the 14th day, and ovum remain viable for 1 to 2 days where as sperm can remain viable for 2 to 3 days so you may be pregnant in 18th day.
So there is no chance of getting pregnant for 30th of september. And you are in your sixth day on 6th october so again chance is very very low.( less than a million- like a miracle),
However you also used medicine which contains both estrogen
Any way in this type of unprotected sex You should use EMERGENCY CONTRACEPTIVES which contains only progesteron.
It acts by-
1) Preventing the fertilisation( meting of sperm with the ovum).
2) It prevents implantation
(prevent attachment of the egg to your uterine wall).
if already fertilisation completed.
3) It interfers the function of corpus luteum
which helps inmaintaining pregnancy
.(If already Implantation completed)
so it acts via 3 mechanism failure rate is very low.
But for its action you have to take it within 72 hours and strictly 72 hours. More earlier the intake more efficient will be the action. But not effective after 72 hours.