Looks like a cavity to me, you might need a filling for that at the dentist.
That's decay.
Cavity. If you’re on nhs you’ll get free dental with being pregnant which is a bonus. I’ve had wisdom tooth problems kicked in from all the extra hormones. Dentist will help you out
Cavity I think. Go to the dentist, baby maybe taking your calcium, I had a friend who has this in her pregnancy so had to have regular dental and extra vitamins to counteract it before it caused big issues