I would think that you would have had to have direct contact with the virus first to get a cold sore. I got mine from my mother or at school and I used to get 2 or 3 a year, I just had my first one in 3 years last week and it's nearly gone now.

Use ice cubes to keep it from getting any bigger, when you are not pregnant you can get a cold sore tablet from the health food store in a red jar, can't think of the name of the company but it is called cold sore relief or just pick up Lysine which is the ingredient in the tablet that reduces the severity of cold sores, safe while b/fing but no studies while pregnant to determine safety as far as I know.

Cold sores blow