Why am I still bleeding a week after sex?

OKay so here itgoes... Im 15 almost 16 though. And I just had sex. The boy iwas doing it with was very very carefull.. It didnt hurt too much. THe boy didnt go rough AT ALL and he was really kind to me. Now after I did it.. I was bleeding like I had my period.. but I thought it would've bee over by now. It's been over a week.I'm not bleeding hard or anything I can manange with two tampons a day.. although I use more for hygienic reasons. sometimes there is redish blood but most of the time there is just brown stuff ( is this blood ? ). I've had the brown' blood' like usaully if my period is ending. So my question is ' is this normal?' Imean it doenst hurt anymore and the boy was really gentle so I couldnt have torn somethin in there ( exept the hymen) . Also a thing you need to know is that I have a very unstable periodtime.. sometimes it takes 4 days ( minimum) sometimes it takes 3 weeks... but my dokter says itsokaycuz imstill a teen. but is this normal still kinda bleeding?

im not pretty sure about that but I think maybe its your first time having sex? and after you do the blood comes out a browner color, its normal.