Dizziness

mnb311

I am 22 weeks and have been soooo dizzy the past couple days.  I haven't had this AT ALL during my whole pregnancy until now.  I've been feeling great, no sickness, no dizziness, no yucky feeling.   WHy am I dizzy all of a sudden?  I cna't figure out if its because I havent been sleeping enough, or because I sit in front of a computer all day at work, or if theres something wrong.  Could there be something wrong or is this normal?