concerned about giving birth

for reference i am almost 34 weeks pregnant so i am nearing the end of my pregnancy. i asked my doctor if an iron infusion needs to be performed and they do not seem concerned. i am very worried about delivery and postpartum bleeding. this is my first pregnancy so idk what’s “normal” or where to go from here. i have been supplementing but i don’t think it’s possible to build my levels back up in time for delivery. any advice is appreciated