Birth control question!!!

Today was the last day of my period and I am starting birth control tonight. The biggest question I have is when I start the pill will it make me ovulate once more? Will it push out an egg early, like today, the day after my period. I’m asking because I know the chances of getting pregnant the day after your period is over is very low but I did have unprotected sex today, and he did pull out. So I’m asking if there is any chance I’ll ovulate the day after starting it or does it stop the egg from being able to come out immediately?