Bleeding?

Emily
Hey lovely ladies, just looking for some advice,
So on Sunday, (today is Wednesday) I had sex a few times and before then I was having abbot of brown discharge. After Sunday it was a little worse. Then on Tuesday and today I had a fair amount of sex also and I've been bleeding a bit, it's only light but it's enough to stain my undies and stuff. I'm on the pill and take it everyday like a ritual. I've also had sore boobs lately and headaches, could this just be side effects from the pill? I plan to stop the pill tomorrow and see if I et my period and see how that goes but yeah any advice in the meantime would be great!
Thanks girls xx