911! LADIES I NEED HELP!!

So I've been taking BC pills for two weeks and three days, okay? I've been having brown discharge . And it's not "just little" it's borderline heavy period . And occasional red spotting. I really need to know how long this is gonna last. What are my periods gonna be like ? What can make the discharging stop?  What other side effects should I look for? I'm 17 BTW 😐 
THANKS LADIES