If a gadolinium contrast is excreted in bile and i have constipation issues does that mean that my body didn't get rid of it?

No: Most of the excretion will be through urine. Not fecal matter.

Gadolinium: Read this: http://www.Radiologyinfo.Org/mobile/en/safety/index.Cfm?Pg=sfty_contrast#top. Contrast materials commonly cause temporary constipation. Your body is getting rid of it - in the stool. Drink plenty of fluids and increase your fiber intake and that should clear the constipation symptoms.

No: Once in the feces, it's gotten rid-of, however long it takes to pass.