Pills and period

Banshee 🐱🐾👻 • PEOPLE ARE STRANGE.
I've been on the ortho tri cyclen lo for 10 months. My "period" lasted from 5 to 7 days, but last month it lasted 3 days and was very light, and yesterday I got my period and (TMI) it had so much clear mucus and it gone, i just stopped bleeding. I'm gonna make an appointment with my gynecologist, but inwas wondering if this had ever happened to anyone else? I take the pills religiously and have my alarm to take it at the same time, they are not intended as BC. I don't get a period and my Dr wanted me to have some kind of bleeding so she prescribed me that to force a "period", i also cant get pregnant. I was wondering, any thoughts on why this is happening?