Does progestogen-only / Mini pill cause vaginal discharge?

I started the mini-pill as a quick method inbetween the time I was waiting to get the Copper Coil contraceptive. It has worked very well! No spotting or bleeding. Except, my periods were slightly heavier but had little to no cramps. I was very skeptical of the pill affecting my mental health but I am not sure as it could be other reasons!

The only side effect I had on this pill was the irregular bleeding. It worked for the first 2 months and then I just bled for the next 4 months (until I stopped). I suffer from VERY painful periods and even when I wasn’t bleeding or it was really light I can recall having 3 huge pain episodes that would last a few days. The pill didn’t affect my mood, but the side effects did because I had to spend nearly all summer inside because of the anxiety and depression. Aswell because of the bleeding I lost interest in sex (again, not caused by the pill directly). Overall I’m disappointed this method didn’t work. If I didn’t have bleeding and unexpected cramps this would’ve been perfect.

I have PCOS, so I don't have periods normally as is and hormonal birth control effects me differently. My review is for the other PCOS girlies who have amenorrhea (lack of/no menses). I started cramping almost immediately. I take the pill at noon everyday, and the cramping sets in 30 minutes later. It is worse at night before bed. As far as emotional side effects, I've noticed I am more apathetic than usual, but otherwise fine.