Iron deficiency?

Hey ladies, i was wondering how to tell if you have an iron deficiency while pregnant. I’m 32 weeks, always out of breath, i get an irregular heartbeat sometimes, always exhausted, and my body is super itchy. Does this sound like i need more iron? I also have a weird need to smell laundry detergent a lot, and i read that if you crave stuff that isn’t food it can be an iron deficiency😬 thanks in advance!

Also, i know my blood pressure is always good~ so i know it’s not preeclampsia :)