pls pls pls help me

hi! so i had sex with my boyfriend on december 23, first minute or so without a condom then we put one on. he told he had wiped before. we did this the day after my period had ended. that was my last period, i was recently on birth control but had stopped. i am now 11 days late but took a test at 6 days late and it came back negative. i haven’t had any signs of pregnancy just some cramps but that is totally normal for me as it is why i went on bc. pls pls help me out!! i know i should take a test but it’s hard for me to get one as i’m under 18. anything helps, thank you