Hi Giselle, congrats on your pregnancy! I was diagnosed first as Gestational while I was pregnant (25 years ago at the age of 27 also) then as Type 2 after pregnancy then Type 1. My endo thinks I was misdiagnosed because I was still going through the honeymoon phase.
Everyone is right about the need to have super tight control when pregnant. My ob-gyn put me on insulin in the second trimester and I was also on a controlled diet although I have since learned that it is much easier to have good control if you eat lower carb. I also saw a specialist called a perinatologist (specializes in high risk pregnancies) once each month (in addition to regular ob visits).
This may have changed since then but the last six weeks of my pregnancy I had to go to the hospital once a week to hook up to a fetal monitor for print-outs so they could make sure the baby was not in distress. They also did extra ultrasounds to check the baby's measurements to determine the size of the baby. (remember this was 25 years ago so things may not be quite the same now). Basically they just kept a really close eye on my progress and I had a beautiful healthy baby girl.
I also agree that you should ask your doctor to write for permission to have enough test strips to test frequently during your pregnancy. I know how expensive those test strips are but the doc should be able to help you. Maybe your doc also has samples he could give you to use for free.
Keep us posted and let us know how you're doing along the way. I'm sure others will chime in as you have more questions.