No LH surge after peak time?

Sarah • 9 years TTC PCOS ectopic Jan 18 miscarriage Jul 20 👼👼 29/07/18 I married my bestfriend ❤

Hello 😊 me and my hubby to be have been TTC for just over 7 years. i have recently been put on Metformin for PCOS and to hopefully help with fertility. I have been using the Clear Blue digital ov tests for 10 days now with no smiley 😟 but on here says my higgest peak was yesterday (Mon)?! Could it that I just haven't released an egg yet maybe or could the Metformin be the culprit? Any ideas please?