no...having your tooth pulled really won't be that painful. wisdom teeth are a totally different story. hopefully your teeth won't shift, but i suppose it's possible. ask your dentist about it. i'm sure you're not the first person with that concern.
i'm always really nervous before ultrasounds. i think it's normal. i always think, "what if they don't find a heartbeat? what if there's something wrong with the baby?" i think it's normal to be concerned. imagine how it must have been 30 years ago when they didn't have all this stuff and you just had to wait til the big day to find out. sheesh! what torture!