The doctor couldt see your strings but on the xrays you could see the Mirena in your uterus?

The doctor may not have been able to see the strings of the Mirena IUD during the examination, which can happen for various reasons, such as the strings being trimmed too short or hidden within the cervix. However, the X-rays clearly showed the presence of the Mirena in the uterus, confirming that the device is correctly positioned. It's important to follow up with your doctor to discuss any concerns and ensure proper placement.