Does progestogen-only / Mini pill cause weight gaining?

I was on this contraception for 12 months and didn't notice any negative side effects. I have heavy periods with pain and after a few months of using the mini pill these mostly stopped which was a great benefit. I have listed weight gain as a symptom however I would not attribute this to the pill and more to unrelated health reasons. Ordered through The Lowdown which I found easy to do. Where possible I prefer not to go through the NHS for cost reasons/hope those who really need their services get them and the Lowdown offered a great alternative.

First few weeks were lovely, no noticeable side effects. Then came the breakthrough bleeding which didn't stop for months on end and still continues to this day at a minimal level. Couldn't fault this pill otherwise but the breakthrough bleeding is a major inconvenience and almost defeats the point of being on a form of BC. Breasts became slightly more enlarged and occasional lower back pains. I just wasn't one of the lucky ones for which bleeding stops completely. Periods are much lighter though but more drawn out. My usual 4-5 days are now 7-9 and that's not counting the daily spotting. It's been good as a temporary measure but I'll be glad to be off Lovima when the time is right because predictable periods >>> unpredictable spotting.

I have found desogestrel good over the last few months compared to my experiences with the combined pill however it has definitely affected my mood. I feel more negative than I would usually and less motivated to start/do things. I am hoping that this will level out as I am on it a bit longer. I have noticed that there is a difference even between the brands of desogestrel, when I switch my mood changes and it takes a couple of weeks to stablise again.