How long should I try until I see a doctor ?

Jessica
I have been ttc since October. Technically have been off birth control since October. 
I count that as 5 months ttc. Just started my period today. I was so hopeful this was my month. I was spotting so light is looked like implantation bleeding (what I have read about it). This is my first time trying I'm 34 and so nervous of the age thing. I have read I should wait a year and I just read 6 months before seeking professional help. I really wanted to do this as natural as possible. But starting my period today has been so emotional for me. I'm sooooo sad. Both my older sisters got pregnant in there first month of trying. I'm also the youngest and feel like I'm running out time for my parents to get time with my future child, like they have been with all of my nieces. I'm just so frustrated and apologize for this run on of a question/ rant whatever you want to call it.