Your action was completely right when you took the pill as soon as possible, repeating it the next day was not necessary but anyway it is not harmfull. I cannot guarantee that you are 100% safe but to a great extent you are not going to be pregnant.
The sooner the I-pill is used the more effective it is. It is 95% effective within 24 hours of unprotected sex, 85% between 25-48 hours, and 58% if taken between 49-72 hours.
There are other determinating fectors such as wether you were ovulating at that time or not.
If you want to prevent pregnancy
by any means, you can augment the action of these pills by having an Intrauterine device
inserted if you are still within one week.
If the period is delayed for more than one week, you should have a pregnancy test or consult your doctor.
I hope these words were usefull to you. Good luck.
Dr. Ahmed Bahaa.