Meghna, ipill is a high dose hormonal birth control which will mess with your cycle. Is this your real period or just the bleeding about a week after taking the ipill?
Emergency contraception is also not 100% effective. If you think you can be pregnant, take a pregnancy test and repeat it 7 days later to confirm the result.
I hope you took other steps to protect yourself from pregnancy and STDs after this incident!
Take care!