If you have been trying to conceive for a year without success, it's time to talk to your doctor. It's normal to take up to a year to concieve, especially if you have recently had an IUD removed or off borth control.
You doctor will likely run a panel of blood work checking your hormone levels. If that is clear, the next steps are imaging studies like a Hysterosalpignogram which check to make sure your fallopian tubes are open. Your doctor can perform a variety of tests to see if there are fertility issues and also ways to treat them.