Undiagnosed Type 2? - GD

Hi ladies! I'm 18 weeks pregnant and my Midwife tested me this week for GD because I was diagnosed in my last pregnancy. With both pregnancies, I only failed the fasting portion of the 2 hour tests. With my last pregnancy, my fasting number was 5.6 and with this one, it was 5.3 (which is the cut off number they use here in Ontario, Canada). I was eventually put on insulin for my last pregnancy, but a very low dose and only at bedtime because my fasting numbers continued to be an issue. I would have the occassional high number after a meal but only reached an 8.0 a handful of times. *Now to my question! My Midwife claims that it's common to be an undiagnosed Type 2 when it's really only the fasting numbers that are problematic in pregnancy. Can anyone else share information on this? I'm terrified and have a great deal of anxiety over this.