Aw, napakahirap yan mama, lalo na 24 weeks ka na at dapat kumpleto ang vitamins! A few of my mum friends had the same iron issue, one of them asked her OB kung pwede ba ng iron supplement sa ibang form, like syrup or chewables, kasi yung tablet talaga ang nakakapag-cause ng nausea at constipation. I'd really suggest checking with your doctor about this kasi ang anemia during pregnancy ay serious talaga, at maybe they can adjust the type or timing ng iron, or even add something para sa nausea, my friend got way better when she started taking hers with food or before bed instead of morning. Hindi mo dapat pinagsisikapan ang sarili mo if it's making you feel terrible, may alternatives talaga!