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There are very very less chances of you being pregnant.Having sex with condom on can prevent ejaculation into vagina and so prevents pregnancy
.Taking an ipill
within 72 hours stands as an effective method of contraception
.The efficiency is more in the first 24 hours than 48 hours than 72 hours. So there are no chances that you could be pregnant.
When you take an emergency pill like ipill , there are possibilities of having menstrual irregularities like delaying and also intermittent bleeding.The delay in your periods is due to ipill.If you would like confirm , please wait for a week and if you still dont get your periods , get a home pregnancy test done.