Does progestogen-only / Mini pill cause vaginal discharge?

Loss of sex drive and mood swings were especially bad for the first 4 months or so. It since has gotten better, but I don't think it's back to normal. I have gained about 10-15 lbs since I've started the pill and I have also bled (more spotting than normal period flow) around 5 days during the second week of the pack and never (or so I recall) during the last four days of the pack. While I'm spotting I have pretty constant cramps, which I didn't have before.

Just started my third pack, originally I was on the combined pill (4+ years) but experienced some migraines so the GP switched me to desogestrel. The first week of taking I had a regular heavy period for 8 days ish and then was okay for about 2 weeks, then the breakthrough bleeding started and has been on and off for 4 weeks now, a mixture of red / brown spotting which is not ideal as I can't be intimate with my partner as its very off-putting. I'm due to meet with my GP over the next few weeks to discuss but I know they will just say this is bleeding is normal for the first few months of taking. I did notice some spots around my chin and mouth area about a month in, they have since gone. I'm losing weight purely because of my good diet and workouts but tis good to know I can lose weight on this pill. Unsure if I want to continue taking these.

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!