Sorry you're under stress. I hope whatever is causing that can be sorted ok.
Yes, stress can cause higher sugars, but you're at a stage where your insulin resistance will be increasing, so that could have an effect too. Test lots and keep in touch with your team so you can get their advice about insulin doses.
I know it's easy to say, but try to relax. Sitting quietly and doung sime deep breathing can help a lot. You might also want to chat to your midwife about it so they know things are harder for you at the moment.
Take care of yourself, and best wishes to you xxx