Aw mama, I feel you, low hemoglobin during pregnancy is stressful talaga! A few of us moms had the same issue, and honestly, iron supplements from the doctor + eating more red meat, liver, spinach, and beans really helped bump ours up quickly. Make sure din na consistent ka sa prenatal vitamins, and timing matters, take iron sa morning with orange juice para mas mabilis ma-absorb, hindi kasama ng coffee o milk kasi nakaka-block. Since you're at 23 weeks, I'd definitely check in with your OB about this to make sure you're on the right supplement dose and they can monitor you regularly. Kaya mo yan, mama, focus lang sa healthy eating at follow through sa meds!