What Are The Chances Of Pregnancy If I Miss 1 Pill From Birth Control Pack?

hi, I am on levlen ed birth control since last month. this is my second pack of Levlen ED. my period finished last Friday and had unprotected sex on Saturday and Sunday. But I missed one pill on Sunday ( the pill is still in the red section but it s the last one in red section). any chance of pregnancy? BTW, I already took 2 pills today, should I take the morning after pill today? thank you