Feeling Light Headed,shortness Of Breath & Exhausted After An IVF

I just finished my first round of ivf and am in my 2week waiting period, 5 days post egg transfer. I have been feeling light headed, shortness of breath went I go up stairs or do something exhausting. I was anemic with my first pregnancy, and had the same symptoms. The put me on an iron supplement. I am afraid to take anything, until my test. What kind of foods can I eat that might help