X-ray hsg..

I have to get an X-ray hsg next week! And I'm so nervous! What If my tubes are blocked! And if I never can have a child! I've been trying for 3 years now, with no luck! My doctor is going to test for pregnancy before the test, I'm hoping I fall pregnant! I really tried this month! Does anyone know what i can expect, has anyone had one done before, what were your results!? Were you blocked!?