Why Am I Having Off And On Bleeding After MRI?

I am a 56 yr old woman, 5 ft 5 200 lbs, asthmatic,
high blood pressure and lots of allergies,I had an MRI with contrast to get a look at a growth on my ankle,I am peri-menopausal and I have not had a period for 4 months but I have 3 cyst in my uterus ,about ten hours after the MRI I began to see light pink spotting that was Wed.June 29th, now I am experiencing off and on bleeding. could the dye have triggered this side effect.