Welcome to HCM,
You have Gestational Diabetes
and taking insulin
yes if blood sugar readings are not controlled then dose may have to be increased, by proper dose titration one can control the level of blood sugar in most of the cases.
Please note you need to take good nutritious diet taking care avoiding refined sugar and too much fats take a regular walk if possible.
It is not clear are you still pregnant or not as in most cases after delivery blood sugar control is rapidly reached.
If blood sugar are still abnormal after delivery then you are frank diabetic and needs treatment accordingly.