Brown discharge? why do i have it?

ok so.. i read that if you use a vitamin c tablet before sex that he can *** in you. well i did that. but he only came a little inside me and pulled out mostly. (yes i know it doesn't matter how much just if he did or not) afterwards i put another in. and then after that one dissolved i put in another then washed out my uhh area after that one dissolved. well a couple days after i started having brown discharge and still have it. (its about the third day into this) and my period is supposed to start sometime next week. i read that too much vitamin c can cause you to become infertile and sometimes with infertility comes brown discharge.. however i also read that brown discharge is a common sign of pregnancy. and right now i don't know what to think. i know i need to get a test. don't bother telling me that please. im working on it. its not easy for a 16 year old girl with crazy *** parents to obtain one of those. also, telling my parents is not an option for me. so please refrain from telling me to do that too. i just need some help in figuring out what is wrong with me and what i can do about it. please please help me out.