its almost been a month... i am 17 yrs... bt didnt got my period yet.. it was suppose to be on 18 july but now its 4 of august... u cant evan say it to my relatives or family... but my bf did not inserted inside... still we had some physical stuff.. i dont know how should i make you understand... but is there any medicine which i can take tp prevent pregnancy.... i think i am because my low back pains... and all...