Hi. I had unprotected sex on the 30th and 31st of March, which is already my fertility period (my period was on 20th of February). Though my partner pulled out before he ejaculates, I am really worried so I took nordette as an emergency contraception several hours after, but I failed to take the second dose. What would be the difference to its effectivity? What are my chances of pregnancy? Please help me, thank you.