GD all of a sudden gone?!?

So I’m almost 36 weeks and over the past few days my sugars have been low. I am not on any medication just diet controlled. I ate a full McDonald’s breakfast this morning and my sugar was 99, 2 hrs after!! I talked with my doctor and she said it’s great my sugars are normal now. Told me to just check twice a day instead of 4x a day! I of course and super excited but also kind of worried. My doctor didn’t say anything about the placenta not working or seem to have any concerns but from what I’ve read normal sugars could mean the placenta is deteriorating?? Ugh so stressed.