@Pollybaby What is your hba1c and diabetic control like? Have you had a discussion with your diabetic team about pregnancy? Most clinics will do a pre conception clinic for type 1 ladies thinking about trying to conceive.
For type 1 ladies aiming for pregnancy they are advised to have a hba1c under 48. Then there are very tight blood sugar targets during pregnancy: under 5.3 fasting, under 7.8 1 hour after eating, under 6.4 2 hours after eating.
These targets are there because high blood sugars immediately before and during pregnancy significantly increase the risks of miscarriage and foetal abnormality.
Type 1 ladies trying to conceive are advised to take high dose folic acid.
And yes, hormones during IVF are likely to make blood sugar control difficult. I suppose if it made it very difficult you could have a gap between egg harvesting (when you'd be pumped full of hormones) to implantation (when hopefully you'd get pregnant) to give you a chance to get control of blood sugar once the hormones are out of your system, but that would require freezing & storing eggs or embryos, which can reduce the likelihood of a pregnancy