How long does it take birth control pills do get out of your system?

Laura • After 4 years of TTC, finally conceived my miracle baby boy and gave birth in June 2020.
I've been off of BC for a week and a half. My doctor said it only takes 3 days for it to completely get out of your system (so I believe her).
Have any of y'all experienced other lengths of time or was told something else by your doctor??