plz read

Hey girls before the hate comments start just wanna say if you hate reading this kind of stuff do leave now but if you're here still reading this thankyou for staying i have a question to ask so i know a lot of us have had a pregnancy scare before but i think im going crazy so im 10 days late for my period i try not to stress about it bc i havent had sex i just masturbated by rubbing my vagina but i aslo used a blanket that my BROTHER sleeps in i have a feeling he masturbated the night before i did lately ive been feeling sore boobs pelvic pain ive taken numerous of pregnancy test all come out negative what are the chances of getting pregnant im having all the pregnancy symptoms