I stopped taking Microlut around the same time, just because I didn't like how I was feeling and was losing self confidence and generally not happy.

I found that after a couple of weeks of not taking it I felt a lot better and a new found enthusiasm for life. We used alternative methods of contraception and I lost some weight and things starting looking a lot better.

I also then starting charting the length of my cycle a few moth later and discovered that I had a 25 day cycle, no wonder I thought as a teenager I was always getting my period

AF didn't start for me until DD weaned, I think, I would have to check some old threads to check, mind like a sieve atm!

It is still possible to get UTD while breast feeding but you need to be ovulating, so I guess what you can do is stop the mini pill, and chart your cyle, or at least look for any changes that might indicate O', perhaps grab some ovulation tests as well.
Take care xxoo