Dogs and Pregnancy

So I recently found out that I’m pregnant and have noticed a change in my dogs behavior, a change for the worse. She is already an anxious dog. But is now naturally very protective of me. Because of this, she is getting snippy with my two year old. Did anyone else experience anything like this, and what did you do? My dog was my first baby and I love her so much, but I can’t have her hurting my babies. Any tips would be appreciated. Please no negative comments and this is really weighing on my heart.