I am currently 7 months pregnant with my 3rd baby and since your immune system is suppressed during pregnancy, pregnant women are more susceptible to cold sores and canker sores.
With my first two I got cold sores and with this pregnancy I have had canker sores twice. The first time I never did anything and it went away on its own in two weeks (two very painful weeks). The second one occurred a week ago so I decided to try Rembrandt’s Canker Sore Toothpaste and I was surprised by how fast it worked. Almost immediately the pain went away and two days later the canker sore was completely gone.
I lucked out and bought the toothpaste on sale at Walgreens with a coupon so it only cost me $2. Usually it is about $7 for one tube. You can get a $3 off coupon on Rembrandt’s website. I would pay full price for this toothpaste if I had to as it offers such quick relief.