i had a lot of oral problems in the first two months, including a VERY PAINFUL infection/virus that gave me these painful blisters on my gums and tongue. i could not eat or drink anything, even water, with out so much pain that i was in tears. so to answer your question i would say yes it is kind of common, and it is a fact that your mouth becomes more sensitive during pregnancy. thats why many girls, including me, gums bleed everytime you brush your teeth. i hope you feel better.
gina lynn