FWB dilemma

Brooklyn
Im 16, ive had a friend with benefits for half a year now. Close friends, and family think we are together and know that we have sex and stuff, and he cummed in me,saturday night. After i had told him not to.. I told him this morning because he was drunk and i was unsure if he had remembered. He never usually cums in me therefore we dont use condoms (plus theyre uncomfortable) and when i looked on here, sunday was the last day of my fertile window which means saturday was part of it to. Im scared i could be pregnant but i am not due on until the 31's therefore i cant take a test to see. And i dont think i could mentally cope with having to get an abortion but neither of us are ready to have a child, and he told me to 'get it sorted' but i dont know what to do.