Measurements

Hi!i'm a first time mom and i got pretty upset lately..my doctor asked me to repeat the A Test on the 16th week of my pregnancy...he aaid it was nothing but i can't stop thinking if something is wrong. The BPD(hadlock) is 40,77 mm but the FL (hadlock) is 22,36 mm... could someone answer me if these measurements are disturbing..?i 've cried my eyes out all day now...thank you!