We R Both Same type Thalassaemia Carriers

Hi all. I'm currently 19 wks. Did my NIPT test on 11 wks and results is low risk baby. However, during my 16 wks gynae appointment, my gynae told me my blood test shows I'm a thalassemia carrier, which also needs my husband to test if he is also a carrier as well. Hence we have proceed to KKH thalassemia registry for our further blood testing, which results both of us are thalassemia minor carriers, also means my baby will have 25% risk of inherit thalassemia major which is high risk, 50% will be a carrier like us, 25% will be normal. My gynae has advised that I should take Amniocentesis to test if baby has the risk. I have told him I will decide after I took my 20 wks detailed scan next week. I'm quite reluctant to take amniocentesis as I felt that my NIPT was low risk, and if the detailed scan is fine, there will be 75% chance of normal/carrier. But both my gynae and husb is suggesting me to take. My husb is just following gynae recommendations. I'm lost and worried. Can anyone advised if they have gone thru similar or heard from friends? Thank you.