How can you tell if you are having a phantom pregnancy?

A ultrasound can and your doctor can tell if you're having a phantom pregnancy.

Pregnancy tests will be negative and there will be nothing to see on ultrasound.

I think I am experiencing a phantom pregnancy too. My period was over a week late but it was nothing but a couple days of brown bleeding. Now I have sore breasts, fatigue, food cravings, extra vaginal discharge, and major bloating but 3 negative urine tests. I think the abnormal period made me believe i was pregnant so therefor my body started to believe it and gave me symptoms with no baby in the oven. That's a phantom pregnancy.