Has anyone had the fallopian tube test...where they shoot iodine up into the uterus & see if it comes out the?

fallopian tubes. Its to test if everything is working properly...Anyone? Just wondering My husband and I have been ttc for a year & the doctor suggested to do some testing to make sure everything is fine....I'm freaking out about it says its safe but still seems werid to me.....Any info anyone has will help.....Thank you so much!