Hi
HbA1c doesn't actually measure blood glucose. It counts the number of red blood cells that have at some point had a glucose molecule attached to them - this is a proxy for blood glucose levels. Because red blood cells live around three months, the test looks back that far, but there's a big skew towards recent weeks. So it's not an "average" of anything.
I'm assuming that your medical team will be monitoring your BG closely because of your previous experience.
That said, 5.5% or 36 mmol/mol is an absolutely normal reading, on the low side. There is a bit of allowable error in the HcA1c test (5% of the reading either way) so the actual value is somewhere in the range 34ish to 38ish.
I'm also attaching a graph that shows what normal - non-diabetic - blood glucose looks like. Unfortunately there have been moves recently to persuade people that what has always been accepted as normal BG is actually "high" - these people generally have something to sell and a vested interest in creating anxiety. Different countries have slightly different standards, but most use a range around 36-41 or 42 to define "normal".