Light headed at 32 weeks??

I’ve been experiencing days in my third trimester that i wake up and just feel extremely light headed. I also just feel off like my balance and everything plus i have trouble breathing where my belly has gotten bigger and baby is pushing up. I also make sure i eat regularly so I’m not sure what else it could be? I feel like if i had some kind of imbalance that the doctor would see it in my urine or blood work by now?

Is this just normal for third trimester??