period 16 days late and counting

Kaela

my boyfriend and i had unprotected sex on december 5th and i took plan b within 24 hours. i was supposed to get my period on december 22, but i know plan b makes your period up to a week late. on december 23 we had sex but the condom came off as he was pulling out so i took another pill to be safe. i got a BFN for both times, but i’m still worried. i know that taking plan b again would probably just prolong my period, but i would like a second opinion just in case? thanks!