Since May I Have Been Having My Period Every 2

Since May I have been having my period every 2 weeks constantly. Usually,before, I would have it once a month or sometimes skipped a month. I have been used to having it twice a month now. I talked to my doctor in June and she said it was due to stress and anxiety id been having. It's almost been a full month since my last period. Is it possible it's just getting back into the normal routine or is there a possibility of pregnancy? I'm very concerned as I'm 17 years old. Please help.