If it's the fact you're pregnant that is making you anxious, not visiting the dentist generally, perhaps you can delay treatment until after you deliver, as it's going to happen soon. Is it painful, is it about to come loose? If you need it pulled because it's going to come loose, of course, you have to do it, but if it's just loose, ask your oral surgeon if it can wait or should wait. Is it infected? Often, teeth are loose because they're cracked, especially if it has a root canal. I would think the only worry about dental treatment is the use of antibiotics, but usually that isn't necessary.