Thank you for the reply. My question is since the pill I took on the first day of my period was slightly different in composition from the one I took from the 2nd onwards, it doesn't result in reduced effectiveness does it?
Also,just out of curiosity if the birth control pill protects from pregnancy straight away, why do most brands advise to use a backup method for the first 7 days?
You had started the pills during the first two days of your periods so you were protected from pregnancy right away. In addition to that you have also taken emergency contraception after sex so you are all the more protected. Emergency contraceptive pills may/may not affect your periods. They can cause early or delayed periods occasionally. Wait for your periods. If they are delayed by more than 7 days take up pregnancy test. Blood HCG determination is more sensitive test for diagnosing pregnancy compared to urine pregnancy test. Visit your gynecologist for more queries and assistance.
Best luck and regards!