Holz I get migraines with aura from time to time, but especially when pregnant. Is that what you mean by blurred vision?
I also get spells of being light-headed with my heart racing, which will lead to me fainting if I don't do something about it (eat / drink / sit down). I think that's pretty common in pregnancy.
If you're worried, get checked out though. I did after my first few migraines the first time I was pregnant - now I know it's normal for my so irritating as they are, I'm not worried.