This could be someting to do with your blood pressure, i have felt dizzy often i am now 32 weeks also seen black dots moving in front of my eyes (got admitted to hospital for it, also had migrane). Your blood pressure may be low and that be causing you to feel dizzy, but if you have had this for 2 days now and its not getting better i would go to the hospital just to get checked out !
Good luck !
Has your iron level been checked? I totally notice a difference if my iron is low. I take an iron supplement once a day and it makes a HUGE difference. I'm 37 weeks now but have been taking iron for several weeks. I know what you're talking about with feeling weak and dizzy.
Also - see if your dr's office has a nurse help line or something where you can ask and get some guidance from their office.
Good luck!
Its not normal. You need to call your doctor to find out what they want you to do.
Anytime something doesn't feel right or normal you need to get checked out. There could be a simple reason why you're having this, but it's better to be safe than sorry.