The message that I am trying to convey is that the course of action that you take is up to you. If you are anxious you can seek help at the end of a year of trying. It may be better if you at least get investigated to ensure that there is no obvious cause for the delay and then continue to try on your own for the next year. However, if you have already been trying for several years, it would be highly recommended to seek help with a fertility specialist immediately. Many infertility units would recommend IVF if you have failed to achieve pregnancy after cohabiting for more than 3 years!
Do not despair, there is hope!