I'm on the contraceptive implant and have been since last march or may I'm not too sure and I don't usually have a period just light bleeding every now and then. This morning I went to the toilet and a lot of dark brown discharge came out, I was just wandering if you knew what it could be? I don't have any irritation down there and iit doesn't smell either so what could it be? I read up a little bit about it and it could lead to pregnancy but is that possible? I always have unprotected sex with my boyfriend who I have been with for over a year.