So I just started taking birthcontrol, I started it the first day of my period. On the fourth day I had unprotected sex and my boyfriend came in me. Should I take plan b just in case the pill still isn't effective or not?

On my birthcontrol pamphlet it says that if you start the pill within 24hrs of your period your protected right away. & since I just ended my period I wouldn't be ovulating yet, but I am irregular

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