Headed to be evaluated bc the nurse at my OB said to. Light headed, dizziness, hard to breathe…

Headed to be evaluated bc the nurse at my OB said to. Light headed, dizziness, hard to breathe sometimes, feeling faint after standing for 20-30 min, headaches, etc. eating doesn't seem to help either. I've been anemic throughout my life and was my last pregnancy as well. Bp was low but not abnormally low when me and my mil checked it this morning (103/44) and HR 110. Any ideas of what could be wrong?