TTC Since October 2013 need help!

My husband and I have been TTC using Glow since October with no luck, I've tried everything! I'm 31 years old and this would be my first pregnancy. When should we seek help  from a DR? It's so stressful when your family and friends keep asking you if your pregnant yet. I have a normal period every month and I ovulate regularly, I don't know waft else to do? All my friends and people around me are having kids :(, it's so hard!