pregnancy tests

ch

so i’m on birth control and my boyfriends and i’s condom broke on the 28th of november and i took a plan b within 30 minutes . i didn’t miss any pills or take any late i was taking them perfectly . my expected period was the 18th and 19th of december and it never came . three days after the first day of my missed period i took a pregnancy test at night and it was negative . i took another eight days after the first day of my missed period ( which i read was the most accurate day ) and it was negative . i also took this one at night . i used clearblue as the test which it said it was the most accurate test . my final question is , we’re those tests accurate ?? ** I REALLY DO NOT NEED CHILDREN AS I AM TOO YOUNG **