Dark brown discharge after masturbating while on birth control

So this month I’ve started taking birth control for the first time. I’m starting the third week today. I’ve been masturbating a lot and I’ve noticed I get a little more wet during masturbation and discharge is clear. Later when I use the bathroom and wipe there is dark brown/red discharge and some on my underwear. So what should I do? I try to stop masturbating for a day and it helps but then I just can’t stop thinking of doing it 🥲