I have been charting for past 2 months and TTC. I have underactive thyroid & levelled since 3 years now at optimal level. I have normal periods and always on time. I have been using OPK and get a smiley every month. However my BBT chart temps are low after my period and then when I'm suppose to ovulate still stays low intact near to the cover line. I had a miscarriage 2 years ago. I don't want to go through that journey again and now thinking if i have low progresterone. My GP done a full blood test done or my hormones and all came back as normal except Sex hormone globin binding which was slightly low (due to insulin) and put me on Metformin. Please can you help and give me any advice. I don't know if I should continue trying.