im 14 and i might be pregnant and i neeed heeelllp

So about 4 days ago i got mad drunk for my birthday and i screwed my friend, im 14, and i feel like i might be pregant because we didnt ue a condom and he told me he pulled out but neither of us have any idea if he really did and i already took a pregnancy test cause im so stressed out and scared, the result was negative but i usually get my period in the middle of the month and now i have no idea what to do if i am pregnant because if i tell my parents they will killl me but i need to do something. Today after using the bathroom when i wiped i wiped up brown blood and im scared if tht means i am pregnant. i really neeeeeed help so could someone please give me some advice on this situation???? im really scared and stressed