Is Change In Periods And Movable Small Cyst In Breast Due To Intake Of Emergency Pills?

I took an emergency pill 9 hours after unprotected sex. My first period came almost 3 weeks later (1 week earlier), lasted for five days, and the bleeding, etc. was normal. But my second period which came three days before the first period after taking the pill, was brown discharge and lasted for five days. Is this normal the only the second period is unusual, and not the first? Can the emergency pill cause a small movable small cyst in the breast because of the hormons? (I have had those before because of hormons and they normally disappear). Thank you.