“Why do I have mucosal sloughing while pregnant?”

I am a 30-year-old female who is 11 weeks pregnant. I have begun to notice, mainly in the morning, lots of tissue peeling from the insides of my cheeks and the insides of my lips (it is not from teeth grinding at night). I have noticed this for several weeks, ever since I found out I was pregnant. I have not changed any oral care (toothpaste etc.), have not really changed the type of food I'm eating (if anything just more bland starches). I don't take any medication. Is this something brought on by changes in my body due to pregnancy or could this be from something else? I have not noticed any other changes to my mouth/teeth since this began. My mouth is not sore or raw at all.