Do you have any other symptoms? It could be a symptom of pregnancy, herpes, eczema, etc.
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It could be cold sores or due to deficiency of iron or Vit B as you are pregnant. It can also be due to herpes, contact dermatitis or due to some form of eczema. Please consult your gynecologist and a skin specialist. Take care!
Sounds like cold sores to me I get them as well BADLY and sometimes when I am very sick or stressed I will start off with one then before it can heal up well and go away 3 more pop up and that will keep happening until my whole mouth is swollen. THAT is when I know I am very sick and need to take my butt to the dr, so in short yeah I think it is a cold sore and I am sorry you have to have it they itch and hurt and make it hard to eat sometimes.