Can a milky discharge be linked with something other than pregnancy? like taking ec

Depends: Does the discharge cause itching? Does it smell odorous? If it neither causes itching nor has a bad smell, likely it's fine. Sometimes excess discharge can be a sign of a bengin bacterial infection and a doctor could help diagnose that for you if it really bothers you, but normal to have discharge every day, clear or white, thick or thin, depending on where you are in your cycle.