Hi
@Linskic are you in the UK? I don't have a clue what units your blood glucose was measured in, as '20' isn't a number that I recognise as being good, sorry.
Sounds like you are having your HbA1c measured tomorrow, the results might come back as mmol/mol or as a % - have a look at my footer for some examples and have a read here:
https://www.diabetes.co.uk/hba1c-test.html
I would love to say 'don't panic' as you don't need to, but I know you will, (I did), but once you get some results you will know where you stand and what the next steps will be. I totally empathise with the worry you must be feeling, it's natural.
If you have been ill, had covid, been on medication like antibiotics or steroids or had any jabs etc. in the last 3 months, mention this to the nurse as they can all temporarily raise your blood glucose and skew the results. She/he might not know what to do with this info, but there is evidence that glucose levels can be effected by more than 'diabetes'.
Make sure you come back here for the words of the wise (and me) and let us know how you got on. Results usually come back within 24hrs depending on where you are, so you should not have to wait too long, and if you are in the UK, and already registered with the NHS App and/or Patients Know Best you will be able to see them as soon as they are available.
Good luck