Advice and kid words needed

So asking you clever bunch! iv just had a phone consultation with a Dr who hopefully going to refer us to a fertility clinic, it was a very frustrating appointment she had no idea why she rang me to begin with so had to read my history and ask a million questions I’d already answered at my first appointment last September 😫 she told a blood test To check if I ovulated which I was told was normal was actually on the lower side she said my number was 20 what the hell does that mean!? And I need to take vid d but didn’t say why, does it mean something else was low? Thank you for any knowledge given 💝