Blood sugar questions

So I’m 18weeks pregnant and I had gestational diabetes in a past pregnancy so I’ve been told to check my sugar.

But when I checked it an hour after eating

It was 74

And then and hour after eating again it was 88

Idk what my fasting levels are and any time I eat I start shaking and feeling terrible. Not sure why..

any thoughts?

I plan to talk to my doctor but any insight would be appreciated also