Anxiety?

A.

Dear friends I am a first time mama to be looking for some insight into some weird feelings! I am 31 weeks and for several weeks now I have been having a racing heart beat/tight chest occasionally combined with feeling light headed and nauseous. I am so confused about why this is happening because it’s usually when my body is at rest. I wondered if I was having anxiety attacks because when I lay down to sleep each night it’s guaranteed to happen. I have never struggled with anxiety before. Anyone else experiencing this? What could it be? I had a normal glucose test, normal blood pressure at dr visits....feeling confused and tired of feeling so weird!