If you're worried about your blood sugar, get a glucometer and test yourself. Consuming some protein will bring up your blood sugar in a few minutes.
As @Arabesque said, your body is going through a lot of changes and it can cause weakness.
I, too, had bouts (and still do) of low blood pressure. We just have to keep an eye on it, but they're not doing anything to treat it. If you think this might be a concern, you can also get a blood pressure cuff and keep an eye on it at home.
I am also now hypoglycemic. I keep protein shakes on hand to help treat my low sugar episodes.
If you're taking any medications to treat your prediabetes, or any blood pressure issues, they might need to adjust your dosages.