Uy, nipple tenderness and itching during pregnancy is super common, lalo na as your body prepares for breastfeeding, but since it's been a week and may swelling na, I'd really suggest checking with your OB just to rule out anything like thrush or dermatitis, kasi sometimes it needs a specific treatment. A few of us mommies experienced similar sa second pregnancy when we didn't have it sa first, and honestly mas intense talaga ang body changes second time around! In the meantime, try keeping the area dry, wear soft bras, and avoid tight clothing, one of my mum friends swears by Mama's Choice Nipple Cream kasi it's pregnancy and breastfeeding-safe at talaga namang nakakatulong sa irritation and itching, so maybe give that a try din while you wait for your doctor's appointment. Huwag mag-worry too much, pero better safe na makita ng OB mo para alam mo exactly what's happening, okay?