Teeth during pregnancy

Have any of you experienced a change in your teeth after getting pregnant? I've heard that during pregnancy you may get cavities easier and your gums may bleed, but this morning I was taking a really good look at my teeth after brushing and flossing and I realized that I have developed a huge gap between my front teeth! I always had a tiny one in the "ends" of my teeth, it wasn't even visible in photos, but now it's big enough to really create a gap between my teeth, it goes all the way up to my gums and can be very clearly seen... Is it the all-day sickness and throwing up that has caused it or what? I haven't had any other problems with my teeth, I went to the dentist before I got pregnant aiming to get my teeth in perfect condition beforehand.