What Are The Side Effects Of Emergency Contraceptive Pills?

hi im sorry i dont know if this is maybe a stupid question but i have been asking my doctor for around a year with a problem and had no result. i am female 20 and have been on loestrin 30 for about 5 months and have previously been on microgynon (30?) for a couple years. i have always had heavy creamy discharge through out my cycle why is this? and i have noticed i have occasions where it darkens in colour more orange-ish more so since starting loestrin - which my doctor prescribed to lessen down discharge. please help how can i stop this. i have had sti tests the works and nothing is there obviously. :( what is this?