So i'm 16, andbi'm kinda new to the whole sex thing. I've had sex maybe 4 times with my boyfriend and every time we've used condoms. After the last time though, i noticed brown discharge in my panties and i've been worried about this and searching what it could be and i've read that it could be from egg implantation or from rough sex or just old blood from the beginning or end of a period but mine had already ended so thats why im more worried about it now, i took a pregnancy test and it came out negative, bug it could've been too early to take it. Any thoughts or advice? Thanks