Progestogen-only / Mini pill and lower back pain

After coming off a combined pill (Yasmin) that I was on for 14 years - I am now on Desogestrel, within a week I suffered a mild acne rash/breakout on chin and neck but some gel from my GP quickly sorted that. I am now 2 days late to what would have been a bleed/period and my lower back and period cramps are quite severe and prolonged - my breasts are bigger and tender to touch - hoping these symptoms begin to decrease if I get my bleed or not! Saw GP today to discuss and they’re just general side effects whilst my hormones adjust (I’m told to allow >3 months to review) - general mood has decreased a bit and I feel a bit numb emotionally but started feeling better today so fingers crossed I’m on the up!

Got pregnant on it because I wasn’t taking it properly, since having my son and ensuring to take it regularly I have had no issues

I swapped from the combined pill to Cerazette because I was having anxiety, dizziness and low libido. These have both improved since changing. The most annoying thing has been inconsistent bleeding and spotting. I won’t bleed for 3 months then will have spotting out of nowhere for 3 weeks. I have also got acne on my chin which I didn’t have before. Overall though these extra inconveniences have far outweighed the reduced anxiety, dizziness and libido issues.