#AskTheExpert Dear doctor, We have done adv usg scan on my 11 weeks 5 days and doctor told me that everyone is normal. but they have not taken 3rd month genetic blood test. is the blood test is must even if usg scan is normal. kindly assist me on this. if blood test need to be taken kindly mention the due date in first trimester until which week of pregnancy I can take blood test for the same