What Are The Side Effects Of Emergency Contraceptive Pills?

I have a question about vaginal discharge. Ive had the problem since before my period ever started; i'm now 19. I dont' have an STD or an infection or anything like that. I'm certain of it. It's just the normal discharge. But I have to wear pantyliners everyday and it's soo annoying. Is there any medication that decreases the amount of discharge? Or a birth control that does the same? I'm currently taking trinessa birth control; if that helps any.