Low iron

My iron was low on Saturday when I had went to the hospital for dizziness and almost fainting, I just found out today that it is low and am now getting put on an iron supplement I’m afraid to take. I want whats best for my baby and I understand taking the iron is what’s best for him but it scares me because I don’t want to lose him I’m in a constant state of worry because I’m afraid I’m going to lose him.. has anyone felt the same way. I’m 22w 2days.