I have'nt had sex since may now I been having light pink spotting brown vaginal discharge threw out. Now its October and I have'nt got my period but I'm still spotting. I took 3 tests at home one at the doctor came up negative. I'm freaking out. Do anybody know what this might be.

If you had your June, July, August and so on periods, you are not pregnant from sex in May.

You could be a STD, it could be a infection and a dozen other things, It would be time to schedule a appointment with your doctor or women's clinic

Do std's causes you to missed your period to because I haven't got my period since September 9 none this month

There's a number of things that can cause missed or delayed periods. It's impossible to diagnose over the internet. I agree with chuck, you should schedule an appointment with your doctor to get to the bottom of this.