Wa'alaikumassalam sis! Don't worry lah, a few of my mum friends had similar findings during pregnancy and baby turned out completely fine, sometimes perut size memang tak match exactly dengan dates, especially kalau dating dari LMP je atau if there's slight variation dalam growth pattern. Since the weight is okay and other measurements normal, Dr probably just monitoring je to make sure baby's doing well, yang tu bagus actually. The mild anemia boleh je affect growth sedikit, so make sure you're taking your supplements and eating iron-rich foods (ayam, daging, sayur hijau) okay? Tapi best lah you discuss more detailed dengan your Dr, ask about the exact measurements, what they're tracking, and when next scan is, sebab they know your full picture and can give you the most accurate reassurance. You're doing great, mama!