Reassure your girl, make sure you're open and she has access to stuff. Pregnant women (even if their beautiful) think there is no way you could be attracted to them. Hormones are out of wack and they are concerned about their security (doubly so if they aren't married to their man I'm sure).
If she wasn't like before pregnancy i wouldn't worry too much and just reassure her. If she was jealous before pregnancy then probably should discuss that too.
My wife and I both have a healthy amount of respect and jealousy for/over each other. The issues is if it becomes unhealthy. My wife has logins to all my stuff, (phone, email, social media, etc.) Almost never looks at it. But she knows I'm fine with her picking up my phone and going through it at any time, I'm not hiding anything! Same goes with her. Just need to define what's important and what boundaries you have!