For The Last Two Week I Have Been Experiences Light

For the last two week I have been experiences light headedness off and on. I does not improve with laying down or standing up. If I move to fast i really notice it. Sometimes a may or may not experience a headache. About two nights ago I was light headed and my chest had a fluttering type feeling. Today when it happened at work I notice my ears felt a little weird and the chest Fluttering happened. I have been taking prenatal pills since i am trying to conceive. I am not sure what to make of what is going on.