BBT temps in Luteal Phase

Hi ladies, just wanted to reach out as I know most of us research a lot. My bbt in the luteal phase seems to sit around 36.30°C to 36.50°C (97.30°F to 97.60°F) until the final dip when AF comes. This does seem to be my normal range in this phase but I do read of woman having higher temps. I don't want to read into it too much but I'm assuming my bodies temperature would be as high as it needs to be to sustain pregnancy right? I have read about women who have progesterone issues, but how in the world did they find that out?