As Azure said, the hormones can mess up your sugar levels - whilst on progesterone, I needed a lot more insulin. But I did check this out with my DSN before adjusting things, just to check this was normal.
Also, don't underestimate that it can be emotionally stressful, which may also affect your levels. I listened to relaxation recordings and, if you haven't tried it, get hold of a colouring book for grown-ups - brilliant!
I'm type 1, pump-controlled, so I don't know what meds & regime you might be on, but the clinic may need to take that into consideration if you have an egg collection, which needs you to fast beforehand. Our clinic put me first on the morning list.
If not already taking it, start a prescription-strength folic acid supplement.
Stay optimistic - but realistic. It is a hard line to walk. We start our second cycle in a couple of weeks.
Wishing you all the luck in the world!