If you still haven't had your period then I would definitely take a pregnancy test now!
If it's negative, or if you've started your period since you asked this question I would say you were most likely dealing with a virus or PMS symptoms. Some women will experience unpleasant symptoms from the start of their ovulation straight through until their period starts (which is two weeks as you describe).
If you continue to feel dizzy, let your doctor know. If you're not pregnant, it could mean you're dealing with slight anemia, true vertigo (which is not fun! I have episodes a few times a year thanks to wonky ears and it's just awful!) or another treatable condition.