gestational diabetes?

So yesterday about 30 minutes after having my dinner I was putting my son in the car and went so dizzy that I nearly fainted. Bearing in mind in 22 weeks pregnant. I felt light headed for the next two hours. So I had a chocolate bar and orange juice to try and boost my sugar levels. My mother in law is a nurse and she came to test my sugars about 45 minutes after the choc and drink and they was still only 5.2. Been to the doctors today and they've sent me for blood tests. Does this look like an indicator for GD?