28 weeks- Failed 3hr GTT

Hi everyone

I failed my 1 hr GTT last week.My mother has Diabetes and also had gestational diabetes when she was pregnant with me.I watched my diet this time but still failed my 3 hr GTT yesterday as my fasting sugar was beyond the normal range, all the levels were high. my doctor put me on 500mg metformin twice a day after meals. He suggested to watch my diet for carbs and sugars. I have an appointment with him next week where he said he will discuss about this in detail and how i should monitor my blood glucose levels. I am a FTM and very tensed about this situation. My parents live in India and I mostly eat vegetarian food and eggs, occasionally i eat chicken. I was wondering if you had any meal plans that you could share with me.What are the things that would benefit me?

It would be of a great help in this situation for me.

Thanks and have a nice day!