Late period

Hi all in November I came off he pill after my dr advised me of needed a break as i had been on for over 6 years. Since November my periods have been every 7.5-8 weeks which worry’s me, but I have been it can take a while for your body to get back into regular cycle.i had a colposcopy where a punch biopsy was taken 8 weeks ago, I had slight bleeding and very dark discharge for around 10 days after but still have no period which I am due! I am due to have LLETZ tr next week and I am worried that’s necsue I have not got my period it will make it come and I will just have a awful lot of bleeding after. I’m also worried about he pain of the treatment and how long I should take off work?