What a terrible time for these sores to start!!
First of all, let me try to put your mind at ease....there are old wives tales that EVERYTHING can cause miscarriage. As long as you are taking good care of yourself, a simple sore in your mouth is not going to cause you to lose your baby.
Sometimes, as teeth come in, they can cause redness and swelling. If part of the tooth is in and there is a "flap" of gum still over it, bacteria can collect and the area can become infected...this is called pericoronitis (sp? It's late, sorry).
It sounds like these may be from the wisdom teeth trying to poke through, but it's hard to tell without x-rays and an exam. Obviously, you can't have x-rays, but the dentist should be able to feel around and tell what's going on.
Most dentists won't do any procedures while you are pregnant. It is very important to contact your OB/GYN and have him/her get in touch with your dentist or vice/versa. They need to coordinate care for you so that no unnecessary chances are taken. Your OB/GYN has his preferences as to which antibiotics his patients can/cannot take in case of infections, as well as his preferences on over the counter medications. Some doctors will even allow you to take prescription pain meds.....it varies from doctor to doctor.
SO, to answer your question. Yes, it is common to get sores or sore areas because of wisdom teeth trying to make an appearance.
Secondly, don't take ANYTHING without consent of your OB/GYN. Not even tylenol. The only thing I can think of that may give you some temporary relief is rinsing with warm salt water...just be sure to spit it out. Additionally, it is VERY important to keep the area around your wisdom teeth clean while you are pregnant. Those crazy hormones can wreak havoc on your gums if you don't. Be sure you are flossing and brushing like you should.
Go ahead and get an appointment. Maybe ask your OB/GYN who he/she recommends.
Best of luck to you. This is a terrible time for this to happen, but don't let fear get the best of you! You and baby will be fine!!
Dental/Oral Surgery Assistant 18+ years
Current Nursing Student