I agree, see your doctor. How long have you been trying? if it's more than 6 months then you can qualify for fertility testing pretty easily. but most doctors say give it 6 months to a year before seeing someone about it.
The the first step would be a consultation with your gynecologist or fertility specialist. There are many possibilities as to why you are not getting pregnant, only some of them psychological. First, it would be prudent to rule out physical issues. Good luck!
-- Dr. Pomerance