Help!!!

Hey,

so basically i had unprotected sex , this is the first week that i went back on the pill i started it on sunday august 27th and today monday september 4th around 3 am i had sex and he came in me. do i need to take plan b? i take my pills everyday but sometimes i am off on times should i still take it? and can i take both birth control and plan b together ?

pls help :))