My periods were due around 9th October.

I had my exams on 8th 9th 10th and 11th October and to delay my periods I was taking one primolut N every day since 6th October.

On 11th I had unprotected sex during which he ejaculated outside. For further safety precaution I took an I pill emergency contraceptive within 24 hours of the act.

Can I still be pregnant?

While only a slim chance, yes it is possible, "withdraw" is not really a method, at least one that works, plenty of sperm in the early fluids. And the I pill is not 100 percent effective.

So best to wait till next month and see if that period comes or not.