Metformin Headache On Metformin For PCOS And Ttc. Last Period Was 33 Days Back. Could I Be Pregnant?

On metformin for PCOS and ttc. Last period was 33 days back. Could I be Pregnant? - metformin headache

I'm taking metformin for three months. After regular intervals of 21 days. Now for 33 days. I do not know if I'm pregnant. I had severe back spasms, back pain, headaches and extreme fatigue in my periods were (ie after 21 days). It lay in a week and now there are no stop signs. There was no bleeding at all in the middle. Has anyone else experienced?
Thank you for any help!