My hba1 was 8.5 when i found out i was pregnant with my daughter ( now 10 ) i had also had a couple of good nights out the couple of weeks before i found out and it really didnt do her any harm so please dont worry or feel bad! I did manage to drop my hba1 down to 6.9 during the pregnancy but it took a lot of hard work and the help of my insulin pump, if you arent on one please see your team and see if you can get funded. Also using libre would help so much so again of you can get funded or self fund it would help so much! Remember though type 1s had healthy babies long before we had all this technology.
Dont feel bad you have not done anything wrong, many, many type 1s have started their healthy pregnancies with worse hba1s than yours and also been living it up before they found out they were pregnant!! Good luck!!