How Many Pill Of Nordette Be Taken To Avoid Pregnancy Effectively?

Hi doc i had a question me and my boyfriend had sex lastnyt he withdraw it so its fine with me...but what ive been worried about was we had another sex today that was 10:39am then he wasnt able to withdraw it all he told me he cum inside...im so worried so wat i did i take nordette 1:25pm today (4pills) then later 1:25am for my 2nd dose..doc is it possible i dnt get pregnant on this?ds is my first tym taking ds drug and i dnt knw if its effective.and what will i do after my 2nd dose? Should i take d remaining tablets to be effective?then how many days should i take pregnancy test?doc pls help me im so scared