The pill

I know there is no way to set that you are on the pill yet. But, I was just wondering how my fertility window is affected by this? I got the app and started my period soon after, I did not start taking my pill once it ended. I know for alot of women it takes awhile  to ovulate again but I am 18 and pretty healthy (cigarettes and caffeine are my only vices). I was just wondering if there's any info someone can give me on statistics on this? Could I have started ovulating right away or not?