Blood results anemic

Newman
I went to doctors at 33 weeks and had loads of blood tests as was feeling really tiered, exhausted, no energy, breathlessness etc. My doctor asked me to come back to discuss my results & he said I was anemic so gave me iron tablets etc and wants to do repeat bloods for full blood count and check folic acid levels etc. I'm now 35+4 weeks, Previous pregnancies I've been told I've been anemic & been given tablets and that's it. Why do they need to be repeated? Anyone else? X