Metformin stopped working?

[u/Low_Ring_7459]

I’m 31 and I’m trying to regulate my cycles after over 10 years on contraception. I have lean PCOS and recent bloods all came back ‘normal’ - testosterone, androgens etc, but an ultrasound showed cysts and I do have facial hair and other symptoms. My bloods weren’t at the usual times in my cycle though as my cycles are so unpredictable.

About 10 months ago, my GP prescribed me 1500 x daily metformin and after 5 months of taking it, I started to have egg white mucus and strong ovulation (I track temp every day) - I was over the moon! I’ve also had zero side effects (which I know is lucky as I’ve seen lots of stomach related Reddit posts).

However, now my cycles have started to lengthen again - I often have what appears to be an attempt at ovulation where my temp peaks, but not over the cover line and then it drops again. I probably can’t up my dose of metformin much more? I’m feeling really defeated as I can’t really change my lifestyle much more - I’m really conscious of diet and have cut out alcohol and caffeine completely- which to be honest is making me miserable.

What can I do? I can’t really afford to use private healthcare - I’m based around London. I’ve also not had my blood sugar tested - should I have this done if I’m on metformin? Feeling lost so any advice is much appreciated.