Invisalign while pregnant?

So I just found out I’m pregnant about a month ago. About 2 weeks before I found out I went to the Ortho for Invisalign. I just got the call that they have arrived to my Ortho’s office and have an appointment to pick them up on Monday. I have mixed feelings about this. First I was extremely excited to get to get Invisalign to straighten my teeth (I need it bad), but not I’m thinking having Invisalign throughout my entire pregnancy and after baby is born ( I need to wear them for about 18 months) might add to the stress. Not being able to snack as often might make me irritated , but also might help not gain as much weight. I’m not sure what to think or what to expect. Has anyone been pregnant while wearing Invisalign? How was your experience? Pros and Cons?